diff --git a/react/features/base/toolbox/components/AbstractToolboxItem.js b/react/features/base/toolbox/components/AbstractToolboxItem.js
index 4da613261..e044bd59b 100644
--- a/react/features/base/toolbox/components/AbstractToolboxItem.js
+++ b/react/features/base/toolbox/components/AbstractToolboxItem.js
@@ -10,7 +10,7 @@ export type Styles = {
     iconStyle: Object,
 
     /**
-     * Style for te item's label.
+     * Style for the item's label.
      */
     labelStyle: Object,
 
@@ -174,7 +174,9 @@ export default class AbstractToolboxItem<P : Props> extends Component<P> {
     }
 
     /**
-     * Handles rendering of the actual item.
+     * Renders this {@code AbstractToolboxItem} (if it is {@code visible}). To
+     * be implemented/overridden by extenders. The default implementation of
+     * {@code AbstractToolboxItem} does nothing.
      *
      * @protected
      * @returns {ReactElement}
diff --git a/react/features/base/toolbox/components/ToolboxItem.native.js b/react/features/base/toolbox/components/ToolboxItem.native.js
index 1262cfe33..ef3e67651 100644
--- a/react/features/base/toolbox/components/ToolboxItem.native.js
+++ b/react/features/base/toolbox/components/ToolboxItem.native.js
@@ -26,7 +26,7 @@ export default class ToolboxItem extends AbstractToolboxItem<Props> {
     }
 
     /**
-     * Helper function to render the {@code Icon} part of this item.
+     * Renders the {@code Icon} part of this {@code ToolboxItem}.
      *
      * @private
      * @returns {ReactElement}
@@ -42,8 +42,9 @@ export default class ToolboxItem extends AbstractToolboxItem<Props> {
     }
 
     /**
-     * Handles rendering of the actual item.
+     * Renders this {@code ToolboxItem}. Invoked by {@link AbstractToolboxItem}.
      *
+     * @override
      * @protected
      * @returns {ReactElement}
      */
@@ -56,25 +57,29 @@ export default class ToolboxItem extends AbstractToolboxItem<Props> {
             styles
         } = this.props;
 
-        let children;
+        let children = this._renderIcon();
+
+        // XXX When using a wrapper View, apply the style to it instead of
+        // applying it to the TouchableHighlight.
+        let style = styles && styles.style;
 
         if (showLabel) {
-            // eslint-disable-next-line no-extra-parens
-            children = (
-                <View style = { styles && styles.style } >
-                    { this._renderIcon() }
-                    <Text style = { styles && styles.labelStyle } >
+            // XXX TouchableHighlight requires 1 child. If there's a need to
+            // show both the icon and the label, then these two need to be
+            // wrapped in a View.
+            children = ( // eslint-disable-line no-extra-parens
+                <View style = { style }>
+                    { children }
+                    <Text style = { styles && styles.labelStyle }>
                         { this.label }
                     </Text>
                 </View>
             );
-        } else {
-            children = this._renderIcon();
-        }
 
-        // When using a wrapper view, apply the style to it instead of
-        // applying it to the TouchableHighlight.
-        const style = showLabel ? undefined : styles && styles.style;
+            // XXX As stated earlier, the style was applied to the wrapper View
+            // (above).
+            style = undefined;
+        }
 
         return (
             <TouchableHighlight
diff --git a/react/features/invite/components/InviteButton.native.js b/react/features/invite/components/InviteButton.native.js
index beeb5c85a..48b2c231a 100644
--- a/react/features/invite/components/InviteButton.native.js
+++ b/react/features/invite/components/InviteButton.native.js
@@ -47,7 +47,8 @@ type Props = AbstractButtonProps & {
 const _SHARE_ROOM_TOOLBAR_BUTTON = true;
 
 /**
- * Implements a {@link ToolbarButton} to enter Picture-in-Picture.
+ * Implements an {@link AbstractButton} to enter add/invite people to the
+ * current call/conference/meeting.
  */
 class InviteButton extends AbstractButton<Props, *> {
     accessibilityLabel = 'Share room';
diff --git a/react/features/toolbox/components/native/OverflowMenu.js b/react/features/toolbox/components/native/OverflowMenu.js
index 1f1d54892..f29354c56 100644
--- a/react/features/toolbox/components/native/OverflowMenu.js
+++ b/react/features/toolbox/components/native/OverflowMenu.js
@@ -3,16 +3,18 @@
 import React, { Component } from 'react';
 import { connect } from 'react-redux';
 
-import { hideDialog, BottomSheet } from '../../../base/dialog';
+import { BottomSheet, hideDialog } from '../../../base/dialog';
 import { AudioRouteButton } from '../../../mobile/audio-mode';
 import { PictureInPictureButton } from '../../../mobile/picture-in-picture';
 import { RoomLockButton } from '../../../room-lock';
 
 import AudioOnlyButton from './AudioOnlyButton';
+import { overflowMenuItemStyles } from './styles';
 import ToggleCameraButton from './ToggleCameraButton';
 
-import { overflowMenuItemStyles } from './styles';
-
+/**
+ * The type of the React {@code Component} props of {@link OverflowMenu}.
+ */
 type Props = {
 
     /**
@@ -22,12 +24,13 @@ type Props = {
 };
 
 /**
- * The exported React {@code Component}. We need a reference to the wrapped
- * component in order to be able to hide it using the dialog hiding logic.
+ * The exported React {@code Component}. We need it to execute
+ * {@link hideDialog}.
+ *
+ * XXX It does not break our coding style rule to not utilize globals for state,
+ * because it is merely another name for {@code export}'s {@code default}.
  */
-
-// eslint-disable-next-line prefer-const
-let OverflowMenu_;
+let OverflowMenu_; // eslint-disable-line prefer-const
 
 /**
  * Implements a React {@code Component} with some extra actions in addition to
@@ -42,6 +45,7 @@ class OverflowMenu extends Component<Props> {
     constructor(props: Props) {
         super(props);
 
+        // Bind event handlers so they are only bound once per instance.
         this._onCancel = this._onCancel.bind(this);
     }
 
@@ -76,7 +80,7 @@ class OverflowMenu extends Component<Props> {
     _onCancel: () => void;
 
     /**
-     * Hides the dialog.
+     * Hides this {@code OverflowMenu}.
      *
      * @private
      * @returns {void}
diff --git a/react/features/toolbox/components/native/OverflowMenuButton.js b/react/features/toolbox/components/native/OverflowMenuButton.js
index 985ec2abb..e398fc3a4 100644
--- a/react/features/toolbox/components/native/OverflowMenuButton.js
+++ b/react/features/toolbox/components/native/OverflowMenuButton.js
@@ -9,13 +9,16 @@ import type { AbstractButtonProps } from '../../../base/toolbox';
 
 import OverflowMenu from './OverflowMenu';
 
+/**
+ * The type of the React {@code Component} props of {@link OverflowMenuButton}.
+ */
 type Props = AbstractButtonProps & {
 
     /**
      * The redux {@code dispatch} function.
      */
     dispatch: Function
-}
+};
 
 /**
  * An implementation of a button for showing the {@code OverflowMenu}.
@@ -26,9 +29,9 @@ class OverflowMenuButton extends AbstractButton<Props, *> {
     label = 'toolbar.moreActions';
 
     /**
-     * Handles clicking / pressing the button.
+     * Handles clicking / pressing this {@code OverflowMenuButton}.
      *
-     * @private
+     * @protected
      * @returns {void}
      */
     _handleClick() {
diff --git a/react/features/toolbox/components/native/Toolbox.js b/react/features/toolbox/components/native/Toolbox.js
index ed60956aa..8fe6876bf 100644
--- a/react/features/toolbox/components/native/Toolbox.js
+++ b/react/features/toolbox/components/native/Toolbox.js
@@ -13,24 +13,29 @@ import { InviteButton } from '../../../invite';
 
 import AudioMuteButton from '../AudioMuteButton';
 import HangupButton from '../HangupButton';
-import VideoMuteButton from '../VideoMuteButton';
-
 import OverflowMenuButton from './OverflowMenuButton';
 import styles, {
     hangupButtonStyles,
     toolbarButtonStyles,
     toolbarToggledButtonStyles
 } from './styles';
+import VideoMuteButton from '../VideoMuteButton';
 
 /**
- * Number of buttons in the toolbar.
+ * The number of buttons to render in {@link Toolbox}.
+ *
+ * @private
+ * @type number
  */
-const NUM_TOOLBAR_BUTTONS = 4;
+const _BUTTON_COUNT = 4;
 
 /**
  * Factor relating the hangup button and other toolbar buttons.
+ *
+ * @private
+ * @type number
  */
-const TOOLBAR_BUTTON_SIZE_FACTOR = 0.8;
+const _BUTTON_SIZE_FACTOR = 0.8;
 
 /**
  * The type of {@link Toolbox}'s React {@code Component} props.
@@ -75,48 +80,10 @@ class Toolbox extends Component<Props, State> {
     constructor(props: Props) {
         super(props);
 
+        // Bind event handlers so they are only bound once per instance.
         this._onLayout = this._onLayout.bind(this);
     }
 
-    _onLayout: (Object) => void;
-
-    /**
-     * Handles the "on layout" View's event and stores the width as state.
-     *
-     * @param {Object} event - The "on layout" event object/structure passed
-     * by react-native.
-     * @private
-     * @returns {void}
-     */
-    _onLayout({ nativeEvent: { layout: { width } } }) {
-        this.setState({ width });
-    }
-
-    /**
-     * Calculates how large our toolbar buttons can be, given the available
-     * width. In the future we might want to have a size threshold, and once
-     * it's passed a completely different style could be used, akin to the web.
-     *
-     * @private
-     * @returns {number}
-     */
-    _calculateToolbarButtonSize() {
-        const width = this.state.width;
-        const hangupButtonSize = styles.hangupButton.width;
-
-        let buttonSize
-            = (width - hangupButtonSize
-                - (NUM_TOOLBAR_BUTTONS * styles.toolbarButton.margin * 2))
-                    / NUM_TOOLBAR_BUTTONS;
-
-        // Make sure it's an even number.
-        buttonSize = 2 * Math.round(buttonSize / 2);
-
-        // The button should be at most 80% of the hangup button's size.
-        return Math.min(
-            buttonSize, hangupButtonSize * TOOLBAR_BUTTON_SIZE_FACTOR);
-    }
-
     /**
      * Implements React's {@link Component#render()}.
      *
@@ -129,31 +96,35 @@ class Toolbox extends Component<Props, State> {
                 ? styles.toolboxNarrow
                 : styles.toolboxWide;
         const { _visible } = this.props;
-        const buttonStyles = {
-            ...toolbarButtonStyles
-        };
-        const toggledButtonStyles = {
-            ...toolbarToggledButtonStyles
-        };
+        let buttonStyles = toolbarButtonStyles;
+        let toggledButtonStyles = toolbarToggledButtonStyles;
 
-        if (_visible && this.state.width) {
-            const buttonSize = this._calculateToolbarButtonSize();
-            const extraStyle = {
-                borderRadius: buttonSize / 2,
-                height: buttonSize,
-                width: buttonSize
-            };
+        if (_visible) {
+            const buttonSize = this._calculateButtonSize();
 
-            buttonStyles.style = [ buttonStyles.style, extraStyle ];
-            toggledButtonStyles.style
-                = [ toggledButtonStyles.style, extraStyle ];
+            if (buttonSize > 0) {
+                const extraButtonStyle = {
+                    borderRadius: buttonSize / 2,
+                    height: buttonSize,
+                    width: buttonSize
+                };
+
+                buttonStyles = {
+                    ...buttonStyles,
+                    style: [ buttonStyles.style, extraButtonStyle ]
+                };
+                toggledButtonStyles = {
+                    ...toggledButtonStyles,
+                    style: [ toggledButtonStyles.style, extraButtonStyle ]
+                };
+            }
         }
 
         return (
             <Container
                 onLayout = { this._onLayout }
                 style = { toolboxStyle }
-                visible = { _visible } >
+                visible = { _visible }>
                 <View
                     pointerEvents = 'box-none'
                     style = { styles.toolbar }>
@@ -172,6 +143,47 @@ class Toolbox extends Component<Props, State> {
             </Container>
         );
     }
+
+    /**
+     * Calculates how large our toolbar buttons can be, given the available
+     * width. In the future we might want to have a size threshold, and once
+     * it's passed a completely different style could be used, akin to the web.
+     *
+     * @private
+     * @returns {number}
+     */
+    _calculateButtonSize() {
+        const { width } = this.state;
+        const hangupButtonSize = styles.hangupButton.width;
+
+        let buttonSize
+            = (width
+                    - hangupButtonSize
+                    - (_BUTTON_COUNT * styles.toolbarButton.margin * 2))
+                / _BUTTON_COUNT;
+
+        // Make sure it's an even number.
+        buttonSize = 2 * Math.round(buttonSize / 2);
+
+        // The button should be at most 80% of the hangup button's size.
+        return Math.min(
+            buttonSize,
+            hangupButtonSize * _BUTTON_SIZE_FACTOR);
+    }
+
+    _onLayout: (Object) => void;
+
+    /**
+     * Handles the "on layout" View's event and stores the width as state.
+     *
+     * @param {Object} event - The "on layout" event object/structure passed
+     * by react-native.
+     * @private
+     * @returns {void}
+     */
+    _onLayout({ nativeEvent: { layout: { width } } }) {
+        this.setState({ width });
+    }
 }
 
 /**
@@ -182,7 +194,6 @@ class Toolbox extends Component<Props, State> {
  * {@code Toolbox} props.
  * @private
  * @returns {{
- *     _enabled: boolean,
  *     _visible: boolean
  * }}
  */
diff --git a/react/features/toolbox/components/native/styles.js b/react/features/toolbox/components/native/styles.js
index c52f95b23..5d1e0eaee 100644
--- a/react/features/toolbox/components/native/styles.js
+++ b/react/features/toolbox/components/native/styles.js
@@ -1,5 +1,9 @@
+// @flow
+
 import { BoxModel, ColorPalette, createStyleSheet } from '../../../base/styles';
 
+// Toolbox, toolbar:
+
 /**
  * The style of toolbar buttons.
  */
@@ -141,6 +145,8 @@ export const toolbarToggledButtonStyles = {
     style: styles.whiteToolbarButton
 };
 
+// Overflow menu:
+
 /**
  * Styles for the {@code OverflowMenu} items.
  *