[QUESTION] How to edit the Design of NativeUI?

Hey, a lot of very cool Scripts/Menus use NativeUI. We want to Open a new Server with our own Design.
So, the NativeUI Menus, wouldn’t fit in our Design.
So is there any way, to edit the Design of the Heading?

Would be cool, if someone could help me.

PLS forgive me because of my bad English.