How to turn off auto brightness on Apple Watch Series 6?

Hey there VictorD420,

Thanks for reaching out to Apple Support Communities. We understand you’d like to know how to turn off auto-brightness on your Apple Watch. We’ll be happy to help.

Follow the steps in this link to help you adjust the brightness of your Apple Watch:

Adjust brightness, text size, sounds, and haptics on Apple Watch

Also, do you have auto-brightness turned on in Settings > Accessibility > Display & Text Size? If not, turn that off and see if that helps.

Take care.

There is no auto brightness setting in the areas you point to above on my series 6 watch. That setting used to be available on my series 4 watch. But now that I’ve upgraded to series 6 I can’t find any auto brightness setting. And the Watch dims in low light which I hate. I want it to always to come on at full brightness. This is very important to me. Please help.

Lots of other complaints about this, see https://discussions.apple.com/thread/251829262