How do I disable Auto brightness on iPhone?

Hello~ Click on below…

Adjust the brightness and color temperature on your iPhone or iPad - Apple Support*

*To turn auto-brightness on or off:

1. In the Settings app, tap Accessibility.
2. Tap Display & Text Size.
3. Scroll to Auto-Brightness and tap to turn the feature on or off.

If you think your screen brightness isn't adapting correctly, try to turn off auto-brightness and then turn it back on.

~Katana-San~

Hello once more~ Glad to help and you’re welcome. Take care care.

~Katana-San~