I got the same hitch as you. I remoevd the two bolts that hold the "socket" onto the metal bracket, then it will slide downward out of the bracket.
I then bought an adapter cable, since my boat has a flat-4 connector. The cable is a coil type that allows it to extend up to 3-feet. So, when I tow I kind of let it dangle at socket, then feed the coil cable over the Curt hitch.
Not very user freindly but I do not tow that often. When finished, I remove the adapter cable and push the Socket back up into the bracket. It stays there without the bolts OK. Out of sight, out of mind.