Show all Sims:  show every sim supported by UGT Manager even if not detected/installed.  Click info/mapping/settings for an individual sim to change options for that specific sim (see more about mapping in mappings section of this manual).
 

Note:  In some rare cases normally seen in the retail version of Assetto Corsa, a sim will not be detected but output to the device will still work.  In this situation, you might want to show all sims to set up mapping/settings etc.