iphones movie appletv app

Hello CalCondor,

Welcome to Apple Support Communities. 

We understand that content being watched n your iPhone via the Apple TV app doesn’t rotate. We are happy to help.

Let’s start by restarting your iPhone. This may help resolve this. Here’s how: Restart your iPhone - Apple Support

1. Press and hold either volume button and the side button until the power-off slider appears.
2. Drag the slider, then wait 30 seconds for your device to turn off. If your device is frozen or unresponsive, force restart your device.
3. To turn your device back on, press and hold the side button (on the right side of your iPhone) until you see the Apple logo.

Please try the steps as listed here: Rotate the screen on your iPhone or iPod touch - Apple Support

1. Swipe down from the top-right corner of your screen to open Control Center.
2. Tap the Portrait Orientation Lock button  to make sure that it's off.
3. Turn your iPhone sideways.

If the screen still doesn't rotate, try a different app — like Safari or Messages — which are known to work in landscape mode.

Learn how to rotate the screen on your iPad.

Let us know if you have further questions.

Take care.