Doing my first playthrough, I'm in the ancient era (picked Hittites). I've just met my neighbour, the Harappans, but hovering over their name/icon in the Diplomacy overview doesn't do anything and I can't figure out a way to go back an era in the culture overview. I'd just like to see what bonuses they get so I know what to anticipate when my Gigir chariots come a-knockin'.

You can use the in-game encyclopedia or the unofficial fandom wiki for this occasion.

Garkes wrote:

You can use the in-game encyclopedia or the unofficial fandom wiki for this occasion.

Not optimal (especially using that ad-bloated wiki) but I'll use them nonetheless, thanks for the help

I second OP request. Or at least a tooltip for opponents’ culture.