Settings
Language and region
Region is set by your time zone or by your choice. It stays on this device, and your location is never used.
Display
Theme
Text size
The buttons along the bottom stay the same size.
11 pm to 6 am, by this device's clock. Only works when Theme is set to "System".
Add to home screen
Add to home screen
In Safari, tap Share, then Add to Home Screen. In Chrome, open the menu and choose Install app (or Add to Home screen). After you've opened it once online, it usually works without a connection too.