SRAM AXS POD controller

Hi all,

I have a new Garmin Edge MTB. I had assumed I could use a spare button on my AXS POD controller to page through screens, my left POD is linked to an AXS reverb seat post. I did  get the submenu "ANT+ Function Setup" one time but it no longer appears. The "ANT+ Function Setup"  didn't let me do anything.

I thought I'd seen people using this on x40/x50 EDGE but a deeper search shows the Garmin documentation is a bit vague and the comments around on the internet don't give much clarity.

Has it worked for anyone?