Thank you for all the thoughtful replies — this is my first time posting in the Evernote forums, and I'm blown away by the speed with which people have come out to help!
Unfortunately, neither solution quite works for me. I need the iPad mini-bar in my Evernote/general workflow (so can’t afford to cut it out completely via the General settings) and even if I move it to the bottom-left corner, it snaps back to the bottom-right corner when I bring out the mini-floating-keyboard (which I do pretty often).
I will let you know if I come up with any solution. This AI Cleanup button is really messing up my vibe!
(and no, that silly button hasn’t helped me clean up anything in any noticeable way either!)