Huge, pixeled font on some websites

StefanEgger This might be to do with the DPI setting used within Windows itself: some apps don't scale correctly if you use non-standard settings (anything other-than 125%, 150% or 200%, e.g. 105%).  In Windows 10, go into the Settings app, then System, then Display and under "Scale and layout" see what is selected in the first dropdown menu.

You can also try adjusting the DPI settings on the Edge browser itself.  Browse into one of these folders:

C:\Program Files\Microsoft\Edge\Application

C:\Program Files (x86)\Microsoft\Edge\Application

and then right-click on the "msedge.exe" file, then go to Properties.  Then click the Compatibility tab and then click the [Change high DPI settings] button.  Make a change there, then log out of your Windows session, then back in, and see if it's made a difference.  If not, keep trying different settings there and see if any of them fix the issue.