iPad Air m1 not showing full screen when mirrored on external monitor

I just bought an iPad 5 on the assumption that M1 finally allowed full external monitor support with stage manager. However, when I connect there iPad to the monitor I get either one of two things: I either mirror the iPad, but with the known horizontal bars that we had with the prior chips; or, I get a full, widescreen screen but with no access to any app, in other words, it is like a blank home screen with which I cannot interact. Can anyone explain how to make this work? Thank you!