diff --git a/src/widget.c/heads.c b/src/widget.c/heads.c
index 85ab869..c8d4255 100644
--- a/src/widget.c/heads.c
+++ b/src/widget.c/heads.c
@@ -128,11 +128,14 @@ void widget_head_DIALOG_WINDOW_design (GtkWindow *main_window, GtkWindow *dialog
 /******************************************************************************/
 
 static GtkWidget *window_header_bar (GtkWindow *window, char *title);
+static void window_left (GtkWidget *header_bar);
+static void window_right (GtkWidget *header_bar);
 
 void widget_head_MAIN_WINDOW_design (GtkWindow *main_window){
   GtkWidget *header_bar = window_header_bar (main_window,
                      "E coli   (with permission from David S. Goodsell, 2009)");
-
+  window_left (header_bar);
+  window_right (header_bar);
   // next line  <=>  calls.on_toggle_STATE_RULES_DATA (btt_STATE)
   gtk_check_button_set_active (GTK_CHECK_BUTTON (btt_STATE), TRUE);
 
@@ -144,7 +147,11 @@ static GtkWidget *window_header_bar (GtkWindow *window, char *title)
   GtkWidget *header_bar = GTK_WIDGET (gtk_header_bar_new ());
   gtk_header_bar_set_title_widget (GTK_HEADER_BAR (header_bar), gtk_label_new (title));
   gtk_window_set_titlebar (window, header_bar);
+ return header_bar;
+}
 
+static void window_left (GtkWidget *header_bar)
+{
   gpointer no_local_data = NULL;
 
   GtkButton *btt_XOR_EXEC_EDIT = GTK_BUTTON (gtk_toggle_button_new ());
@@ -174,6 +181,12 @@ static GtkWidget *window_header_bar (GtkWindow *window, char *title)
   gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (btt_RULES));
   gtk_header_bar_pack_start (GTK_HEADER_BAR (header_bar), GTK_WIDGET (btt_DATA));
 
+}
+
+static void window_right (GtkWidget *header_bar)
+{
+  gpointer no_local_data = NULL;
+
   //  https://iconduck.com/sets/adwaita-icon-theme   https://iconduck.com/sets/carbon-icons
 
   GtkButton *btt_go_home = GTK_BUTTON (gtk_button_new ());
@@ -258,7 +271,6 @@ static GtkWidget *window_header_bar (GtkWindow *window, char *title)
 
 //   g_signal_connect (menu_item_C, "clicked", G_CALLBACK (on_clicked_HOME), no_local_data);
 
- return header_bar;
 }