See my edited post...... I started typing before I totally digested your real problem.
*Edit* Sorry.... I just read your real problem before I started to respond.
I had this same problem on my 2020 Magnitude from the factory. It took me a little reading and troubleshooting and then I figured it out.
The Freedom X has a built-in control panel and then Thor adds the Remote Control Panel in the coach so it is easier to access the controls for the Inverter.
Thor likely left the built-in control panel power switch in the "On" position. It needs to be in the "Off" position for the Remote Control Panel to take over control of the Inverter. Otherwise the built-in Control Panel over-rides the Remote Panel.
You need to find where your Inverter is mounted (likely in an outdoor storage compartment close to the battery trays) and you will see the built-in control panel in the center of the unit. Make sure the push button is extended, which is the "Off" position. Then you will be able to turn the Inverter on and off with the Remote Control Panel as well as change any of the settings.