- Swipe up from the bottom of the screen to reveal Control Center.
Look for the icon that shows a lock with a curved arrow around it. This is the screen orientation lock.
- Tap the orientation lock icon to lock the screen to its current position. Tap it again to unlock.
- When you're done, single click the home button again to be returned to your apps
If Rotation Lock is ON this will overrule Week Calendar's rotation settings.