I replaced/edited almost all textures within the UI and replaced all round icon-textures with square ones including
UI-Classes-Circles.
There are some exceptions like the old garrision
spec/role ones or round
faction icons but these are not affecting those frames.
Also replacing the files in the
Masks-Folder did nothing.
I am unsure if this can be done by just replacing textures since I can't find anything else related but maybe I am missing something.