alt Hacker NewsI've been away from Macs (2015 MBP and an M1 Pro) for a while now, but they used to have a limitation of one screen per port. Apparently driver related as according to my faulty memory a Linux install didn't have the same issue.
Are you using Apple displays or did they fix it?
They must have fixed it because I drive my two main monitors from a dock connected to one port and then my 3rd monitor from the other port. Been set up this way for at least two years now.