Welcome to the forum, PTT!
alohart, PTT does say that he's had two i3s before so glasses are probably not what's at work here.
PTT, when the i3 got the 42kWh battery in 2019 it also got a revision in the iDrive software, trading the vertical list of menu items for a horizontally scrolling line of tiles. As an original owner of a 2014 i3, I don't care for the new style (I believe it's iDrive 7, but someone jump in if I've got that wrong).
I've not seen an accommodation for type size in newer BMWs so I'm not surprised that you're running up against a wall. You should definitely express your concern to BMW NA (it's old school, but when it's something that's important to me, I write a physical letter – email gets you nothing but a boilerplate reply).
Oh, one other thing you could do that might actually have some impact is to file a complaint with NHTSA:
If it's hard to read the nav screen then this very well may be a safety issue.