To make it worse, there's a Thunderbolt port which is indicated by a little lightning-bolt near it, and a charging port which is indicated by a little lightning

To make it worse, there's a Thunderbolt port which is indicated by a little lightning-bolt near it, and a charging port which is indicated by a little lightning bolt near it, and neither of those has anything to do with the Lightning connector. Some USB-C ports have DisplayPort output, so there's a DP near them. Some do Power Delivery, so there's a battery near them. And some are also a power input to the laptop, so there might be other random symbols near them. It's chaos. I just juggle plugs until I get the expected behavior, and sometimes I never do because it's not implemented. I've given up.