Maybe is a problem with Qt libs since kdenlive UI has similar issues and looks bad on fedora 32 kde spin.
Any help is appreciated.
Shotcut version 20.04.14
Info of my system:
Operating System: Fedora 32
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.13.2
Kernel Version: 5.6.16-300.fc32.x86_64
OS Type: 64-bit
Processors: 8 × AMD Ryzen 5 2500U with Radeon Vega Mobile Gfx
Memory: 15.3 GiB of RAM
Screenshots of the UI
Kdenlive example
Display configuration: