I tend to default to dual mode, though it’s not the software default you have to switch into it.
That’s odd. What else did you ask them to do? If they aren’t careful, changes they make in the other programs can proliferate into the partner mic program.
Was it Costco who set them previously? It would be very quick to roll you back to previous settings if so. Just call and see if you can drop by and have them do that.
Lots of good suggestions here for tweaking the Roger settings. Try to elevate it on the table too, on a cup or napkin holder. But presenter>pointing>table. Depending on the level of noise in the restaurant, table mode might not cut it. But it does sound like there are still adjustments that could be made. Would be useful to know what your audiogram was. Are you open fit? Was there REM?