Shortcut not working after install

I used to have “z” as a shortcut for undo. I noticed that Anking modified another shortcut for suspending cards to “@” but I can’t figure out what it may have changed the undo to (if it in fact is the culprit). Can anyone please advise?

(For reference: I used to use “Customize Keyboard Shortcuts” addonn, but that doesn’t have any effect on things in Anking.)

“u” should work when reviewing cards.