What I did:
Put Agenda in split screen with another app. Left sidebar showing, related panel hidden. Switched to another app, then switched back.
The edges of the notes are cropped. If you resize the split screen slider just a little it pops back into space correctly. Also pops back into place if you just tap into a note.
What I expected:
Things that might be helpful to know (Agenda version, OS and model, etc):
IPad Pro 11”, M1 chip, latest OS just released this week, Agenda is up to date
Screenshot showing crop: