Screen Mirroring
i dont have customize controls anywhere on my iPhone 8 plus iso14.7.1
iPhone 8 Plus, iOS 14
Question marked as
Use AirPlay to stream video or mirror the screen of your iPhone, iPad, or iPod touch - Apple Support
If screen mirroring or streaming isn't working on your AirPlay-compatible device - Apple Support
If an app or feature on your device is not working, it may have been disabled using Screen Time, or by an IT administrator if you are using a device owned by an employer or educational institution. See how to Use Screen Time on your iPhone, iPad, or iPod touch - Apple Support