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Is there a way to change the color of the "all blue, all red,..." buttons in the sketch panel? I'm shure there is ....I only want to know how.
I need to change all my lines into a specific color.

Or maybe there's a way to automatize this, so it automatically changes the linecolor of all instances in a specific layer?

This was both already covered here ... search?

thanks Mr Slowtiger. I searched and found. The topic is called "change ink pot color". And it answered all my questions (on this topic).