I planned an IFR flight from Salzburg to Nürnberg within the (MSFS2024) EFB. After that I did choose the "Send to ATC" option. I booted up the Avionics and the FMS did show "Downloading Flight plan - Experimental feature" and inserted the FP automatically.

The problem is that there are no Arrival procedures to choose from within the FMS, soI did put those in Manually.

Then I got the decent and approach clearance via ATC, but after ATC finished giving me the clearance the FMS started to insert the waypoints automatically again and I lost my manually inserted Arrival routing.

I would like to know if it is possible to disable this"Experimental feature" within the FMS.