Hey.

Just noticed that when I draw with a dark color, like black or gray. There will come a white pixel edge.
Is there something I can turn off to make it go away?
It's really annyoing due to the fact that it seems bad on the image when it's done.

Thanks!
https://imgur.com/TnEwUGX

Did you use Selection or Fill tool to color ?
If so you can adjust Grow Selection in Tool Option.
Setting>Dockers>Tools Option

It may be that this is caused by the Anti-alias option in the brush preset settings. You can try changing that by clicking the 'Edit brush settings' icon on the toolbar and then unticking the option in the brush editor window.

https://i.imgur.com/Kr2UXBp.png