How to set unique SSIDs for each frequency Technicolor CGM4981COM.

I have a Technicolor CGM4981COM.  Have a pod but it caused even slower connections than the bare modem so disconnected it.

I am trying to connect to the 6E network with an iPad 11" 4th generation which has 6E but generally only connects to 5 GHz or 2.4 using the combined SSID.  Know that it does work since I did connect to it once.  I'm 3 feet away from the modem.

Am trying to create unique SSIDs for each frequency so that I get the right connection.  In the Xfinity App under advanced settings there is no option to set the SSID for each frequency.  Can't even find how to change the combined  SSID.