如何用KivyMD制作一个裁剪的导航抽屉(这样它就不会覆盖MDToolbar)？

from kivymd.app import MDApp
from kivymd.uix.navigationdrawer import NavigationLayout, MDNavigationDrawer
from kivymd.uix.toolbar import MDToolbar

class MyApp(MDApp):
    def build(self):
        # 创建主布局
        layout = NavigationLayout()

        # 创建MDToolbar
        toolbar = MDToolbar(title="My App")
        layout.add_widget(toolbar)

        # 创建MDNavigationDrawer
        drawer = MDNavigationDrawer()
        layout.add_widget(drawer)

        return layout

def toggle_drawer(self):
    drawer = self.root.ids.nav_drawer
    drawer.set_state("open" if drawer.get_state() == "close" else "close")

toolbar.right_action_items = [["menu", lambda x: self.toggle_drawer()]]

if __name__ == "__main__":
    MyApp().run()