joplin/packages/app-desktop/gui/WindowCommandsAndDialogs/commands/toggleMenuBar.ts

import { CommandDeclaration, CommandRuntime } from '@joplin/lib/services/CommandService';
import Setting from '@joplin/lib/models/Setting';
import { _ } from '@joplin/lib/locale';

export const declaration: CommandDeclaration = {
	name: 'toggleMenuBar',
	label: () => _('Toggle menu bar'),
};

export const runtime = (): CommandRuntime => {
	return {
		execute: async () => {
			Setting.toggle('showMenuBar');
		},
	};
};