The thing on the photo is the only thing that is visible after starting any app from the Corel Suite X8
Solved! This issue appeared after one of the windows 10 updates ( between 01.07.20 - 04.07.20 ). I installed Corel 32bit edition and issue disappeared. I don’t know why it was happening in 64-bit version but I’m happy that it works now.
So you're happy with working with the slower version. lol