Minecraft how do I get these chunk lines away?

I pressed something earlier and I don't know how to get rid of it (are not chunkborders so F3+ G doesn't do anything)

Thanks!

Is not a vanilla feature.

Which mods or extensions have you installed?

Optifine Worldedit and a Worldedit addon

The last two are on the server side or in the client?

Everything in the client

I found it… Was a chunk render thing with my WE addon

I thought it was okay.

Purely out of curiosity: the next thing I would have advised you to take a look at the controls. Would it have been there?

Press F3 and Q once, then from 1.12 you will get a list of functions somewhere there's then a function to show / hide it.
Or just press F3 and G directly.

Yes it is. Look here for https://minecraft-de.gamepedia.com/...2DTasten.).

No it is not.

First, read the whole question. He says himself that it is not.

Second: Pay attention to the colors at the section borders and the thickness of the lines. In the picture they are white, Minecraft Vanilla yellow and red.

Third: Pay attention to the lines that go through the middle of the chunk, they don't exist with the vanilla borders.