Resolved by myself,
in regedit
HKEY_CURRENT_USER\Software\Ludeon studios
I had 2 seperate folders "RimWorld" and "RimWorld by Ludeon Studios"
However I changed the first one, it never applied, until I realized the second one contains the same config files, and once I edited those, it worked.
Edit: Alternate method someone told me
"In the config folder there is a prefs.xml file.
Open that file with any text editor and you can change the UI scale setting back to 1"
in regedit
HKEY_CURRENT_USER\Software\Ludeon studios
I had 2 seperate folders "RimWorld" and "RimWorld by Ludeon Studios"
However I changed the first one, it never applied, until I realized the second one contains the same config files, and once I edited those, it worked.
Edit: Alternate method someone told me
"In the config folder there is a prefs.xml file.
Open that file with any text editor and you can change the UI scale setting back to 1"