### Godot version

4.1.1

### System information

linux

### Issue description

[simplescreenrecorder-2023-08-30_15.01.51.webm](https://github.com/godotengine/godot-proposals/assets/71937306/537d92b9-4f98-4fe6-adf4-71297be0471a)

I guess this wasn't the case before since I could save a layout named "2 monitors".

### Steps to reproduce

press space

### Minimal reproduction project

none
add_preview_button->connect("pressed", callable_mp(this, &ThemeEditor::_add_preview_button_cbk));
	DefaultThemeEditorPreview *default_preview_tab = memnew(DefaultThemeEditorPreview);
	preview_tabs_content->add_child(default_preview_tab);
	default_preview_tab->connect("control_picked", callable_mp(this, &ThemeEditor::_preview_control_picked));
	preview_tabs->add_tab(TTR("Default Preview"));
	preview_scene_dialog = memnew(EditorFileDialog);
	preview_scene_dialog->set_file_mode(EditorFileDialog::FILE_MODE_OPEN_FILE);
	preview_scene_dialog->set_title(TTR("Select UI Scene:"));
	List<String> ext;
	ResourceLoader::get_recognized_extensions_for_type("PackedScene", &ext);
	for (const String &E : ext) {
		preview_scene_dialog->add_filter("*." + E, TTR("Scene"));
	}
	main_hs->add_child(preview_scene_dialog);
	preview_scene_dialog->connect("file_selected", callable_mp(this, &ThemeEditor::_preview_scene_dialog_cbk));
	main_hs->add_child(theme_type_editor);
	theme_type_editor->set_custom_minimum_size(Size2(280, 0) * EDSCALE);
}
void ThemeEditorPlugin::edit(Object *p_node) {
	if (Object::cast_to<Theme>(p_node)) {
		theme_editor->edit(Object::cast_to<Theme>(p_node));
	} else {
		
		
		
		
		
	}
}
bool ThemeEditorPlugin::handles(Object *p_node) const {