2020-04-15, 09:45
I could find it meanwhile and modified to my needs. It was the primary.jpg, which is used as overlay for the complete screen. It has basically a circular overlay, which looks in reality almost straight in top and bottom. Thats why I didn't expect it's this file
I pushed several more changes and started to exchange buttons with glow effect on focus.
I pushed several more changes and started to exchange buttons with glow effect on focus.