Open the Settings app
Tap Control Center
Tap Screen Recording
Tap the green plus (+) to add it to Control Center (if not already added)
Swipe down from the top-right corner to open Control Center
Tap the Screen Recording button
If prompted, choose Microphone On or Microphone Off
Wait for the 3-second countdown to start recording
To stop recording, tap the red status bar at the top of the screen or open Control Center and tap Screen Recording again
Find the recording in the Photos app under Recents or in the Screen Recordings album (if available)