[KevinH]

And I have attached a screenshot of the settings for "Desktop & Dock" that I use.

I always disable "Stage Manager", and turn off all ways to forcibly tile the windows.
And you can see those and my other settings in the screen shot that is attached.

I am a firm believer that the user putting app windows where he/she wants them and nothing should move or resize them. But that is me.

My guess is you have different settings under the "Mission Control" part of that Settings screen or something else.

You might want to also check your Accessibility settings as many Mac utilities can control desktop assignment and tiling.

Hope something here helps.