### 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
return Object::cast_to<Theme>(p_node) != nullptr;
}
void ThemeEditorPlugin::make_visible(bool p_visible) {
	if (p_visible) {
		button->show();
		EditorNode::get_singleton()->make_bottom_panel_item_visible(theme_editor);
	} else {
		if (theme_editor->is_visible_in_tree()) {
			EditorNode::get_singleton()->hide_bottom_panel();
		}
		button->hide();
	}
}
ThemeEditorPlugin::ThemeEditorPlugin() {
	theme_editor = memnew(ThemeEditor);
	theme_editor->set_custom_minimum_size(Size2(0, 200) * EDSCALE);
	button = EditorNode::get_singleton()->add_bottom_panel_item(TTR("Theme"), theme_editor);
	button->hide();
}