It’s the first thing I mentioned in my reply 
I’d be interested in hearing opinions about whether a compact view should alter the font size when a dedicated setting is already available.
It’s not a big deal obviousy as I won’t jump from a density setting to another twice a day… Being curious more than anything here.
I had a quick look at a few software that offers various density modes. I compact mode,
-
Discord and Google Gmail/Calendar don’t change the font size.
I believe Slack doesn’t too (I didn’t try, just looked at screenshots) -
Microsoft Outlook reduces the font size from 14px to 12px.