For some reasons my brush stroke suddenly looks like this:
As the picture showed, the edges are jagged and pixelated. It doesn't happen before and it's just one of the built-in inking brush.
I know there are a lot of similar questions here but please don't mark this as duplicate. I double checked all the thing the other answers suggested: It's brush tool, not pencil, and my mode of brush and layer is Normal, not Dissolve. It's pixelated even if I draw with mouse so it's not tablet driver issue. I disabled GPU render but nothing changed. How do I fix this?