Just bought the TP-Link BE9300 ( Archer BE550), it has 3 SSIDs as default, obviously one is for 5ghz and one for 6ghz, but also one without a GHz extension, Q1) Why is there 3 SSIDs whats the one with

Hi All, I only bougjht the AXE5400 Extender last year but I was thinking of upgrading my router to the Velop Pro 7 or 6 but would like to know if the Extender Mesh (OneMesh I think) is compatabile wit