I followed this steps
The following should solve this problem (at least it worked for me on my 4k 15" notebook monitor, with 250% font scaling).
- right click on the DaVinci icon
- choose the compatibility tab
- change High DPI settings
- overwrite High DPI scaling, choose "System"
Sadly I didn't have any success with that. It shows a little bit less big but still looks difficult (to not say impossible) to work. I downgraded Resolve to to 13.2