Studio One is the third (unfortunately hidden) option. You need to use the encoder to scroll down.
I understad ! but there is not third option only tow, for Logic and Protools !
Then Studio One is not connected to your computer via Ethernet. The computer running Studio One must be on the same network as the mixer.
ooh BIG thanks for info ! !! i was missing that I must to rage the Studio One before I use the Ucent to choose Studio one !