FaceTime screen rotation

Hi Yaar Punjabi,

Welcome to the Apple Community.

Wondering which iOS version you have installed on your iPhone 12 Pro Max.

Re: "FaceTime screen rotation"

How to check the "Portrait Orientation" Lock button is on or off in iOS 15

https://support.apple.com/en-us/HT204547

Change FaceTime video settings on iPhone:

says:

"During a call in the FaceTime app, you can turn Portrait mode on or off,

switch between cameras, or turn your camera on or off".

Complete article: https://support.apple.com/en-au/guide/iphone/iphfb3d2a12b/ios

Or you might want to check the Control Centre settings:

Edit Control Centre on your iPhone, iPad and iPod touch

https://support.apple.com/en-au/HT211812

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Re: "happens when i used other apps during FaceTime"

Wondering which method you used to return to FaceTime ... see if anything in these Apple support article helps

Use other apps during a FaceTime call on iPhone

(NB: Choose correct iOS version at top of page that opens from the link, for accurate info.)

https://support.apple.com/en-au/guide/iphone/iph3dc0cb20d/ios

Switch between open apps on iPhone

(NB: Choose correct iOS version at top of page that opens from the link, for accurate info.

https://support.apple.com/en-au/guide/iphone/iph1a1f981ad/ios

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We are all Apple users like yourself in this community.

So, if you want Apple to be aware of the difficulty you are having, there's a Feedback Form for FaceTime:

Apple FaceTime Feedback Form

https://www.apple.com/feedback/facetime/

All the best :-)

Thank you for your reply, Yaar Punjabi,

and thank you for trying everything.

You might want to take your iPhone in to an Apple store, for expert help, if possible..

a Genius Bar reservation is recommended:

https://www.apple.com/retail/geniusbar/

or

See a list of Apple phone numbers around the world.

https://support.apple.com/en-us/HT201232 

and / or

You might want to send feedback to Apple.

If others are experiencing the same issue, it may be addressed in a future update.

Webpage with links to Feedback Forms:

https://www.apple.com/feedback/

All the best :-)