A nice, but unpolished onboarding callout directing people towards a more useful shortcut, in Google Docs. I’m holding arrow keys without ⇧ here first, then with ⇧:

To improve it, I would add some sort of small celebratory “completed!” state, and auto-hide it afterwards; right now, it seems that it hides on a delay, likely regardless of what happens.

(Testing onboarding is hard because once it’s invoked it disappears forever. If you are worried about onboarding experiences in a place you work, please insist on easy toggles to bring it back for testing. And no, one-size-fits-all “reset onboarding” is too crude; ideally you can reset each specific one easily through a simple UI.)

Thank you to Ezra Spier for the tip.