meta-rpi-diya/recipes-wlroots/labwc/files/menu.xml

<?xml version="1.0" encoding="UTF-8"?>

<openbox_menu>

    <menu id="client-menu">
        <item label="Minimize">
            <action name="Iconify" />
        </item>
        <item label="Maximize">
            <action name="ToggleMaximize" />
        </item>
        <item label="Fullscreen">
            <action name="ToggleFullscreen" />
        </item>
        <item label="Always on top">
            <action name="ToggleAlwaysOnTop" />
        </item>
        <item label="Close">
            <action name="Close"/>
        </item>
    </menu>
    <menu id="root-menu">
        <item label="Terminal">
            <action name="Execute" command="foot -t xterm-256color" />
        </item>
        <item label="Reconfigure">
            <action name="Reconfigure" />
        </item>
        <item label="Exit">
            <action name="Exit" />
        </item>
        <item label="Reboot">
            <action name="Execute" command="sudo /sbin/reboot" />
        </item>
        <item label="Power off">
            <action name="Execute" command="sudo /sbin/halt" />
        </item>
    </menu>

    <menu id="some-custom-menu">
        <item label="Reconfigure">
            <action name="Reconfigure" />
        </item>
        <item label="Exit">
            <action name="Exit" />
        </item>
    </menu>

</openbox_menu>