By the version numbers it looks like you have installed openHASP firmware on the device.
The GPIO configuration should look like this:
I don’t have a US version, so you might need to select L8-HD (AU) instead of the EU version. Be sure to restart the plate after making changes.
If the dimmer in the base still fails to respond, it is best to power cycle the whole device by cutting the 120V AC for ~30 sec. The dimmer in the base is initialized by the ESP32 at boot-up. If it received too much garbage because of the incorrect GPIO configuration, it might need a reset.
I used this basic pages.jsonl for local control:
{"page":1,"comment":"---------- Page 1 ----------"}
{"obj":"label","id":8,"x":5,"y":5,"w":230,"h":30,"text":"Kitchen Dimmer"}
{"obj":"slider","id":13,"x":25,"y":45,"w":45,"h":195,"groupid":12,"max":255}
{"obj":"switch","id":14,"x":130,"y":30,"w":80,"h":50,"groupid":12}
In HA it looks like this and the controls are working fine:
