How to reset image 'handles' to older, simpler version?

Long time no see everybody. I have recently upgraded from x11 to x18 and was quite shocked by the changes. Especially by the thick handles and object borders. It almost looked like kid tool. I wonder if using 4k monitor would make them look more decent ;-). Anyway thanx for the hint Eva-K, editing registry helped a bit, althought the handling icons look a bit out of place with the thin outline around object. This or that, I'm glad I can now switch the new style on and off easily.