Positions for left and right sockets have been fixed at yon_ubl_setup_sockets function

source/libublsettings-gtk3.c

@@ -859,7 +859,7 @@ void yon_ubl_setup_sockets(GtkWidget *main_window, GtkWidget *left_window, GtkWi
             }
             gtk_style_context_add_class(gtk_widget_get_style_context(left_window),"inherited");
             gtk_container_remove(GTK_CONTAINER(gtk_widget_get_parent(left_window)),left_window);
-            gtk_box_pack_end(GTK_BOX(box),left_window,0,0,5);
+            gtk_box_pack_start(GTK_BOX(box),left_window,0,0,5);
         }
         if (socket_right_id>-1&&right_window){
             plug_right=gtk_plug_new(socket_right_id);
@@ -882,7 +882,7 @@ void yon_ubl_setup_sockets(GtkWidget *main_window, GtkWidget *left_window, GtkWi
             }
             gtk_style_context_add_class(gtk_widget_get_style_context(right_window),"inherited");
             gtk_container_remove(GTK_CONTAINER(gtk_widget_get_parent(right_window)),right_window);
-            gtk_box_pack_start(GTK_BOX(box),right_window,0,0,5);
+            gtk_box_pack_end(GTK_BOX(box),right_window,0,0,5);
         }
         g_object_ref(main_window);
         gtk_container_remove(GTK_CONTAINER(gtk_widget_get_parent(main_window)),main_window);