Don't change any settings in Elbrus, just let SGP handle everything for you. There is no explanation of further setting required because there are no further setting required
Setup an Equipment Profile for each of your two imaging setups, and base your sequences off of the appropriate equipment profile. When you setup each equipment profile, make sure you put in your telescope focal length on the Telescope tab. That way SGP will know your image scale and can pass the correct image scale hint to Elbrus.
I like to use the "5x5 degrees with dual angle" plate solve option in SGP. That gives the fastest solves but requires the camera angle to be known. Before I do the first plate solve with Elbrus I do a blind solve with Astrometry.net which gets the camera angle and saves it in the sequence. If you want, you can also save the camera angle in the equipment profile (File => Save Sequence as Profile). If you don't want to worry about the camera angle, select the "2x2 degrees at any angle" search option on the plate solve tab.
You should definitely setup astrometry.net as a backup blind solver. Installing the local astrometry.net is a good option. Check the option "use blind solve failover" on the plate solve tab of the equipment profile manager (or the sequence control panel.)