On iPad OS 15 (PB 1), you hold the Globe key or hit Globe-M to bring up the global keyboard shortcut and menu viewer, and hold command or for app-specific, and/or you can hit command-? to go straight to the menu search.
I’m not having much luck finding a video demo, but it’s a really nice UI that I’d like to see ported to the Mac.
See https://sixcolors.com/post/2021/06/think-globally-the-ipads-new-universal-keyboard-shortcuts/