The first thing you must do is to launch the Control Center. To activate the Control Center, you need to go to your home screen. Let you swipe your screen from the top right side to the bottom left one.
You will see the red lock button; it is a locking screen. Tap the red lock button to be black to enable your rotate screen.
Restart your iPhone 11 and see it will work soon!
Some Necessary Fact
Finally, Enabling screen rotate on the iPhone 11 must be one of the helpful features available on all Apple devices. With iPhone 11,