I have the Wireless MX mouse with a horizontal scroll wheel, but PD doesn't recognize it. I assume that the Ergo also uses the Logitech Options app, where you can assign all kinds of actions; however I don't have any custom buttons/actions defined there as I'm used to all the keyboard commands.
In fact, customizing the hotkeys works better for me. See if this
post will give you any ideas for your keyboard
or Ergo.
YouTube/optodata
DS365 | Win11 Pro | Ryzen 9 3950X | RTX 4070 Ti | 32GB RAM | 10TB SSDs | 5K+4K HDR monitors
Canon Vixia GX10 (4K 60p) | HF G30 (HD 60p) | Yi Action+ 4K | 360Fly 4K 360°