Since the new font was introduced a few years ago (the main font that one sees on, for instance, a person's Details page), I've heard several complaints that it doesn't look as sharp or professional as it used to. I have to agree.
Can you post a screen shot of what you are seeing? The font looks fine to me but I have seen several people whose system fonts got corrupted and when that happens, FamilySearch looks really strange. What device are you using and what system software?
I stopped using one browser a while back because I did not like the appearance of the font. If you switch between, say, Firefox, Chrome and Edge, you will see differences - though these might be too subtle to bother many users.
Also, when I had problems with adding "Following" labels, it was suggested I used Edge instead of my other two browsers, and this certainly was of help in speeding the process along.
So, I would definitely suggest switching browsers, to see if the fonts (and other features) might be more to your liking.