I tried different font settings in the font settings and it didn’t improve much (font hinting, anti aliasing, custom DPI settings, different font size)
The font is the default one which is Ubuntu Regular with font size set to 10
Sub pixel order is set properly to RGB Linux Mint xfce
Even when running windows in a virtual machine, the font rendering in it is miles ahead of what I got on my Linux setup!!!
Did you turn off any fancy UI tweaks like scaling (especially fractional)? Have you confirmed if your session has a compositor running?
Also, try something like this
Depending on your overall OS and sessions setup, your distro install may not be tweaked properly for Xfce, which still doesn’t have Wayland support last I checked. So unless you made sure to clear out all the other global configs that could impact the GUI session, you’ll probably have some issues unless you switch to an Xfce catered distro.