Inputing Lyrics in Musescore | MuseScore

I’m not sure if my suggestion is something individual or something general, because I’ve changed style files several times.

Try the following:
Load Format / Style. This will open your styles folder and there should be some style variations. Load one that may come with the Musescore installation or test MuseJazz.mss.
Otherwise you will find some style files in “C:\Programs\MuseScore 3\styles”. For example, copy “legacy-style-defaults-v3.mss” from there into your personal styles folder and load it.
Then you can change the font back to ‘Comic Sans’ and save it as new style or your default style.

Maybe your default loaded style is corrupted. Check under Edit/Settings/Score which style is used and load another one for a test.

I did it as described: see the result attached.