How do one remove slave from an interface now?
If “now” means “after upgrading from pre-6.41” where you could declare one Ethernet interface to be a master one, and indicate other Ethernet interfaces as its slaves, this method of configuration has been replaced by the “new bridge setup” where the same effect is provided by making the previous “master” and all of its “slaves” member ports of the same bridge, and setting hw=yes for all of them on the corresponding rows in /interface bridge port. So to remove a given interface from the bridge completely, disable/remove the corresponding row in /interface bridge port; to prevent the switch chip from forwarding frames to/from this interface, rather than sending them to the CPU, set hw on the corresponding row in /interface bridge port to no.
Okay Sindy, it took awhile as I had been looking at the bridge on the interface tab … eventually found it … thank you!