diff --git a/contain.c b/contain.c
index 2d26600..599b98d 100644
--- a/contain.c
+++ b/contain.c
@@ -100,29 +100,31 @@ GtkWidget *get_edit_space_page_new(){
   return space_grid;
 }
 
+GtkWidget *get_run_space_left_box(){
+  GtkBox *left_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
+  gtk_box_append (left_box, GTK_WIDGET (get_ELAPSED_TIME_box()));
+  gtk_box_append (left_box, GTK_WIDGET (get_test_image()));
+  gtk_box_append (left_box, GTK_WIDGET (gtk_separator_new (GTK_ORIENTATION_HORIZONTAL)));
+  gtk_box_append (left_box, GTK_WIDGET (get_objects_and_situations_horizontal_pane()));
+  return GTK_WIDGET (left_box);
+}
+
+GtkWidget *get_run_space_right_box(){
+  GtkBox *right_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 0));
+  gtk_box_append (right_box, GTK_WIDGET (get_RUN_STOP_box()));
+  gtk_box_append (right_box, GTK_WIDGET (gtk_separator_new (GTK_ORIENTATION_HORIZONTAL)));
+  gtk_box_append (right_box, GTK_WIDGET (get_XYZ_box()));
+  gtk_box_append (right_box, GTK_WIDGET (gtk_separator_new (GTK_ORIENTATION_HORIZONTAL)));
+  gtk_box_append (right_box, GTK_WIDGET (get_ZOOM_box()));
+  return GTK_WIDGET (right_box);
+}
+
 GtkWidget *get_run_space_page_new(){
-/*
-  GtkBox *lateral_right_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_VERTICAL, 40)); // spacing
-  gtk_box_append (lateral_right_box, GTK_WIDGET (get_RUN_STOP_box()));
-  gtk_box_append (lateral_right_box, GTK_WIDGET (get_scroll_speed()));
-  gtk_box_append (lateral_right_box, GTK_WIDGET (get_STEP_by_STEP_box()));
-  gtk_box_append (lateral_right_box, GTK_WIDGET (get_XYZ_box()));
-  gtk_box_append (lateral_right_box, GTK_WIDGET (get_ZOOM_box()));
-*/
-
-  GtkWidget *space_grid = gtk_grid_new();
-// same result using either :   get_ELAPSED_TIME_box()   or   get_simulation_time_extent_buffer()
-  gtk_grid_attach (GTK_GRID(space_grid), GTK_WIDGET(get_ELAPSED_TIME_box()), 0, 0, 1, 1);
-  gtk_grid_attach (GTK_GRID(space_grid), get_test_image(), 0, 1, 1, 2);
-  gtk_grid_attach (GTK_GRID(space_grid), gtk_label_new ("\n"), 0, 3, 1, 1);
-  gtk_grid_attach (GTK_GRID(space_grid), get_objects_and_situations_horizontal_pane(), 0, 4, 1, 1);
-
-  gtk_grid_attach (GTK_GRID(space_grid), GTK_WIDGET(get_RUN_STOP_box()), 1, 0, 1, 2);
-//  gtk_grid_attach (GTK_GRID(space_grid), GTK_WIDGET(gtk_separator_new (GTK_ORIENTATION_HORIZONTAL)), 1, 1, 1, 1);
-  gtk_grid_attach (GTK_GRID(space_grid), GTK_WIDGET(get_XYZ_box()), 1, 2, 1, 1);
-  gtk_grid_attach (GTK_GRID(space_grid), GTK_WIDGET(get_ZOOM_box()), 1, 3, 1, 2);
-
-  return space_grid;
+  GtkBox *page_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0));
+  gtk_box_append (page_box, GTK_WIDGET (get_run_space_left_box()));
+  gtk_box_append (page_box, GTK_WIDGET (gtk_separator_new (GTK_ORIENTATION_VERTICAL)));
+  gtk_box_append (page_box, GTK_WIDGET (get_run_space_right_box()));
+  return GTK_WIDGET (page_box);
 }
 
 void window_bar(GtkWindow *window, char *title){
diff --git a/contain.h b/contain.h
index 295a1c4..215fbdc 100644
--- a/contain.h
+++ b/contain.h
@@ -14,6 +14,8 @@
 #define H_STYLES_PANE 60
 
 void activate (GtkApplication *app, gpointer user_data);
+GtkWidget *get_run_space_left_box();
+GtkWidget *get_run_space_right_box();
 
 GtkWidget *get_run_space_page_new();
 GtkWidget *get_run_rules_page_new();
diff --git a/contain.o b/contain.o
index 67676cc..66d0386 100644
Binary files a/contain.o and b/contain.o differ
diff --git a/display.c b/display.c
index e5852ae..c24c876 100644
--- a/display.c
+++ b/display.c
@@ -102,7 +102,7 @@ static GtkBox *get_objects_box(){
 static GtkBox *get_situations_box(){
   GtkBox *situations_box = GTK_BOX(gtk_box_new (GTK_ORIENTATION_HORIZONTAL, 0));
   gtk_box_append (situations_box, GTK_WIDGET (gtk_label_new ("   transcription     ")));
-  gtk_box_append (situations_box, GTK_WIDGET (gtk_label_new ("   promotion opéron lactose    ")));
+  gtk_box_append (situations_box, GTK_WIDGET (gtk_label_new ("   activation opéron lactose    ")));
   gtk_box_append (situations_box, GTK_WIDGET (gtk_label_new ("   translation     ")));
   gtk_box_append (situations_box, GTK_WIDGET (gtk_label_new ("   transport Na/K     ")));
   gtk_box_append (situations_box, GTK_WIDGET (gtk_label_new ("   ubiquitination     ")));
diff --git a/display.o b/display.o
index be6438d..eefa20c 100644
Binary files a/display.o and b/display.o differ
diff --git a/myprogram b/myprogram
index 1823160..11b9a55 100755
Binary files a/myprogram and b/myprogram differ