### 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
VBoxContainer *items_tab = memnew(VBoxContainer);
	items_tab->set_custom_minimum_size(Size2(0, 160) * EDSCALE);
	data_type_tabs->add_child(items_tab);
	data_type_tabs->set_tab_title(data_type_tabs->get_tab_count() - 1, "");
	ScrollContainer *items_sc = memnew(ScrollContainer);
	items_sc->set_v_size_flags(SIZE_EXPAND_FILL);
	items_sc->set_horizontal_scroll_mode(ScrollContainer::SCROLL_MODE_DISABLED);
	items_tab->add_child(items_sc);
	VBoxContainer *items_list = memnew(VBoxContainer);
	items_list->set_h_size_flags(SIZE_EXPAND_FILL);
	items_sc->add_child(items_list);
	HBoxContainer *item_add_hb = memnew(HBoxContainer);
	items_tab->add_child(item_add_hb);
	LineEdit *item_add_edit = memnew(LineEdit);
	item_add_edit->set_h_size_flags(SIZE_EXPAND_FILL);
	item_add_hb->add_child(item_add_edit);
	item_add_edit->connect("text_submitted", callable_mp(this, &ThemeTypeEditor::_item_add_lineedit_cbk).bind(p_data_type, item_add_edit));
	Button *item_add_button = memnew(Button);
	item_add_button->set_text(TTR("Add"));
	item_add_hb->add_child(item_add_button);
	item_add_button->connect("pressed", callable_mp(this, &ThemeTypeEditor::_item_add_cbk).bind(p_data_type, item_add_edit));
	return items_list;
}
void ThemeTypeEditor::_update_type_list() {