IOS 15 facetime - missing center stage

For iPadOS15, Centre Stage settings are accessed from the Control Centre whilst a supported App is running. Swipe downwards from top-right of the screen:

Be aware that Centre Stage is only supported by 2021 models of iPad Pro, the iPad9 and iPad mini6.

I too cannot access center stage, either in FaceTime or control panel settings.

I have the iPad Pro 12.9” 4th gen Wi-Fi model

I find it can be set up when you open face time. I can’t see it in settings either.

CenterStage can, also, be activated in the Control Centre drop down in the upper right hand corner of the iPad’s screen.