The font size thing is a known issue, it only mentions the username at the top though.
this post was submitted on 16 Jul 2023
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whoever designed this layout needs some serious help. Repeating your username three times just makes it look super awkward
Well, it's not for no reason. The middle one is the Display Name, which is the same as their username by default. The top is for account switching and the small bottom one is the "real" username. I don't see anything wrong with this. Maybe they could merge the small bottom text that shows your username with the account switcher, but otherwise I see zero issues with this.