Split screen function is missing on my iPad Pro after update

Hello,

After a recent update-that I wasn’t aware was happening, the three dots at the top of my iPad Air gen 5 screen no longer functions as before. Instead, I only have ‘enter full screen mode’, ‘add window’ and ‘minimize’ then ‘close’. Also, every time I open an app, it’s in the new ‘floating window mode’ or whatever it’s really called. Can I go back to the way it was before? With all my apps opening in full screen mode and the three dots behaving as before? I ASSUME this new method is to make it easier to switch between windows and apps but I was doing just fine before. In the future, it might be a better policy if Apple OFFERED the “new” methods with a full demonstration as to how they would work rather than surprise me with what they consider a ‘gift’.

Thanks in advance for any help at all. Quite frankly I’m surprised it updated without my permission as I removed the ‘auto download and update’ permission. This has been very enervating and aggravating and your help would be most appreciated.

Kind regards,

MDM (Mad Dog Mother)

[Re-Titled by Moderator]