Can't minimize desktop window

Under 'Window', the [command]M is greyed out and I can't find a way to activate it so I can minimize the Keybase window, which is now edge-to-edge on my Mac laptop screen. (MacOS)

Start by reproducing the issue on macOS with the Keybase window expanded edge-to-edge, then inspect the Window menu and the disabled Command-M action. Determine why minimizing is unavailable and verify that the command or an equivalent window control works without affecting other window behavior.

Written by the indexing model from the issue text.