diff --git a/eeschema/sim/sim_plot_frame_base.cpp b/eeschema/sim/sim_plot_frame_base.cpp
index ed3d2c9b61..9c65d7cfd5 100644
--- a/eeschema/sim/sim_plot_frame_base.cpp
+++ b/eeschema/sim/sim_plot_frame_base.cpp
@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////
-// C++ code generated with wxFormBuilder (version Oct 26 2018)
+// C++ code generated with wxFormBuilder (version Sep  8 2021)
 // http://www.wxformbuilder.org/
 //
 // PLEASE DO *NOT* EDIT THIS FILE!
@@ -146,7 +146,7 @@ SIM_PLOT_FRAME_BASE::SIM_PLOT_FRAME_BASE( wxWindow* parent, wxWindowID id, const
 
 	m_sizerPlot = new wxBoxSizer( wxHORIZONTAL );
 
-	m_workbook = new SIM_WORKBOOK( m_plotPanel, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxAUI_NB_CLOSE_ON_ALL_TABS|wxAUI_NB_MIDDLE_CLICK_CLOSE|wxAUI_NB_TAB_MOVE|wxAUI_NB_TAB_SPLIT|wxAUI_NB_TOP );
+	m_workbook = new SIM_WORKBOOK( m_plotPanel, wxID_ANY, wxDefaultPosition, wxDefaultSize, wxAUI_NB_CLOSE_ON_ALL_TABS|wxAUI_NB_MIDDLE_CLICK_CLOSE|wxAUI_NB_TAB_MOVE|wxAUI_NB_TOP );
 	m_workbook->SetMinSize( wxSize( 200,-1 ) );
 
 
diff --git a/eeschema/sim/sim_plot_frame_base.fbp b/eeschema/sim/sim_plot_frame_base.fbp
index 1055c04dcf..f244c6557c 100644
--- a/eeschema/sim/sim_plot_frame_base.fbp
+++ b/eeschema/sim/sim_plot_frame_base.fbp
@@ -758,7 +758,7 @@
                                                                 <property name="resize">Resizable</property>
                                                                 <property name="show">1</property>
                                                                 <property name="size"></property>
-                                                                <property name="style">wxAUI_NB_CLOSE_ON_ALL_TABS|wxAUI_NB_MIDDLE_CLICK_CLOSE|wxAUI_NB_TAB_MOVE|wxAUI_NB_TAB_SPLIT|wxAUI_NB_TOP</property>
+                                                                <property name="style">wxAUI_NB_CLOSE_ON_ALL_TABS|wxAUI_NB_MIDDLE_CLICK_CLOSE|wxAUI_NB_TAB_MOVE|wxAUI_NB_TOP</property>
                                                                 <property name="subclass">SIM_WORKBOOK; sim_workbook.h; Not forward_declare</property>
                                                                 <property name="tab_ctrl_height">-1</property>
                                                                 <property name="toolbar_pane">0</property>
diff --git a/eeschema/sim/sim_plot_frame_base.h b/eeschema/sim/sim_plot_frame_base.h
index 9e194a437f..eef64284da 100644
--- a/eeschema/sim/sim_plot_frame_base.h
+++ b/eeschema/sim/sim_plot_frame_base.h
@@ -1,5 +1,5 @@
 ///////////////////////////////////////////////////////////////////////////
-// C++ code generated with wxFormBuilder (version Oct 26 2018)
+// C++ code generated with wxFormBuilder (version Sep  8 2021)
 // http://www.wxformbuilder.org/
 //
 // PLEASE DO *NOT* EDIT THIS FILE!