Using a High-DPI monitor with high resolutions such as 3840px and above, you may have noticed that DaVinci Resolve does not really care about Windows system scaling settings.
You may have also tried to force override DPI handling in the shortcut properties, which kind of works, but makes fonts blurry.
Here his how to fix DaVinci Resolve High DPI scaling to respect your windows settings without blurry fonts
Edit the shortcut target of DaVinci Resolve to use this:
C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe -WindowStyle Hidden "$Env:QT_DEVICE_PIXEL_RATIO=1;$Env:QT_AUTO_SCREEN_SCALE_FACTOR=1;start 'C:\Program Files\Blackmagic Design\DaVinci Resolve\Resolve.exe'"
Then start DaVinci Resolve like usual. It should now respect whatever scaling factor you applied onto your Windows Desktop, for example 150%.