DefaultHelpMenu

The help menu.

Not in the default chrome, and its trigger is why: it rendered a bare ? with no plate and no placement, so it sat in the container's top-left corner, under the menu plate. Everything in it — the accessibility preferences, print, the shortcuts dialog — is reachable from the main menu, so there was nothing behind the ? that was not already one row away.

It stays exported and slot-fillable: components={{ HelpMenu }} puts it back, now docked at the bottom-right rather than stranded.