I would say, nuke it from space
Enable MSAA 2D
in the project settings under Rendering / Anti Aliasing
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You can also use this add-on I created for 3.x: https://github.com/godot-extended-libraries/godot-antialiased-line2d
There is a pull request updating it for Godot 4, but it had a few issues preventing me from merging it: https://github.com/godot-extended-libraries/godot-antialiased-line2d/pull/8
how i get that ?
2D MSAA isn’t impplemented in the Compatibility rendering method yet, so it’ll only work if using Forward+ or Mobile.