Where is documentation about differential pair routing

I want to match the length of differential pair of two routes, but lengths do not change. Is there any help file or other up to date info about this.

FYI: I can find the route differential pair command. It makes ugly routes. Then there is a command “tune differential pair length” and it says “too short”, but what then, I know that tracks are not of equal lengths.

My KiCad version is Version: (5.99.0-13139-ged3642c5c7), release build

In 5.1.x you press mouse at tracks and drag toward another track end.
As my lines were divided into several parts and I wanted to have not parts but global length the same I used only Tune Track Length (Alt+7) function. When that function is on the Ctrl+L hotkey you should also use. I don’t know 5.99.

Allright, I’ll try this. I tried to tune allready routed tracks but perhaps I should try to start from beginning.

I think it works that way.

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