Assigning widgets in Omnisphere

I just am beginning to use Omnisphere after not having touched it in over a year. I’m integrating in an Arturia Keylad 88mk2 and am getting confused how to connect widgets in Omnisphere. The widgets I need for the moment are all set up in a rackspace. I want to set up my expression pedal to control one of the volume controls in Omnisphere. All I can recall is control clicking on the specific control and getting a drop down menu with all the MIDI options. What do I need to select from this drop down and connect it to a widget?

You have to enable host automation in omnisphere

See here: Gig Performer | How do I get widgets to learn Omnisphere parameters?