@Jacquemartes 

Please somebody at TP link at least respond to this. It is a bona fide question.

  @David-TP 

Sorry. I'm new to this. A week or two ago, I experimented with opening up the dedicated Wi-Fi backhaul 6 GHz to network traffic. I've since decided I don't wanna keep it that way, but since then I cannot find the option to switch it back to the way it was.
 

This is one of my satellites. Can anyone tell me if it's configured properly with a 6GHz Wi-Fi backhaul? Or where is the setting that lets me rededicate the Wi-Fi backhaul once again?

David-TP wrote

  @Jacquemartes 

You could go to the device settings of the satellite Deco XE75 to check the current Mesh Backhaul bands

 

The 6GHz still works as the Backhaul bands with 2.4 GHz and 5 GHz. The current change is only an APP UI optimization in order to maintain a consistent design with the 2.4/5 GHz Wi-Fi network in the Deco app.

 @David-TP 

 

The settings on my 2 satellites say I'm connected to the main router by all 3 bands, 2.4 GHz/5GHz  and 6 GHz. So there is no dedicated backhaul. This sounds like more just a UI change, but a substantive change. This seems to substantiated by the post from @TexasLoner above, who also seems to have lost the dedicated wi-fi 6 backhaul.