Is there a way to change the aspect ratio while using AirPlay with my iPhone?

Okay so I just figured out how to screen mirror to my tv without wifi(connect iPhone & tv to same wifi connection like an old router, Old phones hot spot, anything giving off a signal) & I don’t have an Apple TV, I do have the Apple TV app on my tv but I searched the settings I didn’t see anything I might’ve missed it. I got it connected no problem. The issue is the screen fit, I cannot find how to adjust it to save my life. There’s really no screen mirror settings on the iPhone 13. PLEASE HELPPP

[Re-Titled by Moderator]