@hark@lemmy.world Though I probably will get downvoted for my shameless self-plug and stance against them, you should read my post on Hexbear: https://lemm.ee/post/5751850. If you don’t have time to read it all, you should at least read the tl;dr and the Edit 1 near the end of the post.
Please don’t use serif fonts for UI elements. Imagine the buttons on your file manager being Times New Roman. (eww.) I think what you’re looking for is a monospaced font that’s designed to distinguish O/0, I/1/l, etc.
Plug for one of my favorite fonts: https://www.jetbrains.com/lp/mono/