I am sure, I have seen the GAFOR routes in an earlier version or on the trial.
Nevertheless, I actually don't see GAFOR routes with the "OMX" indications in Austria or Switzerland.
I have the latest version (3.6?)

At least in Switzerland I can see small, grey dotted lines where I usually find the GAFOR routes
Can I switch them on ?

Same problem here:
In SD 3.6.0 (iOS) the GAFOR routes in Slovenia (including the "OMX" information) light up, but not in Austria and not in Swizerland. In those countries I only see the dotted grey lines. I downloaded already weather for all of the maps/countries and "show GAFOR" in the weather menue is switched on

@Tim:
"needed altitude": Every GAFOR route in Austria comes with a reference altitude, that indicates the lowest safe altitude to fly along this specific route