One of an iPhones most useful features is adjusting the screen brightness based on the environment or battery levels.
Launch theSettingsapp on your iPhone.
When the parameters app opens, scroll down and tap onAccessibility.

On the Accessibility screen, tap onDisplay & Text Size.
On the next screen, turn off the toggle forAuto Brightness.
To manually adjust the screen brightness on your iPhone, pop launch the Control Center.

To fire up the Control Center, swipe down from the top right corner.
On the Control Center, find the brightness slider and adjust it as needed.
Turn Off Attention-Aware Features
Attention Aware Features are another reason for iPhone dimming the display automatically.

Heres what you oughta do.
To get started, launch theSettingsapp on your iPhone.
When the tweaks app opens, tap onAccessibility.

On the Accessibility screen, tap onFace ID & Attention.
On the next screen, turn off the toggle forAttention Aware Features.
When the parameters app opens, tap onDisplay & Brightness.

On the Display & Brightness screen, turn off the toggle forTrue Tone.
Next, tap on theNight Shift.
On the next screen,turn offthe toggle besideScheduled.

Auto lock is another feature that dims your iPhone screen.
When the options app opens, tap on theDisplay & Brightness.
On the Display & Brightness, tap onAuto-Lock.

- grab the Auto-Lock toNever.
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