Eight white dots appeared on the edge of my iPhone 15 Pro Max display

Hello~ Click on below as they are Visual Motion cues to prevent car sickness…

Use iPhone more comfortably while riding in a vehicle - Apple Support*

1. *Go to Settings  > Accessibility > Motion.
2. Tap Show Vehicle Motion Cues, then tap an option. If you choose Automatic, animated dots appear on the screen when iPhone detects that you’re riding in a car or other on-road vehicle; the dots are hidden when the motion stops.
3. To manually show or hide Vehicle Motion Cues, open Control Center, tap , then tap an option.

~Katana-San~

That looks like the Vehicle Motion Cues feature, which displays dots on your iPhone's screen when you are in a vehicle and moves in the direction of it to help reduce motion sickness.

You can turn it off in Settings > Accessibility > Motion > Show Vehicle Motion Cues > Off.

BiroAttys wrote:

THX. I fond it, but I dont know why turned on this feature?

Hello~ I have turned on many things unknowingly or by accident on my devices. If you have issues with car sickness…this really works wonders for me.

~Katana-San~

BiroAttys wrote:

THX. I fond it, but I dont know why turned on this feature?

You're welcome. It's possible you had the feature set to automatically turn on when in a vehicle, so that prompted it.