4Knob Upright - How to access interface?

Cubase 11.0.30 | Halion Sonic SE3 3.4.30

I can access the 4Knob Upright patches in Halion Sonic SE3, but how do I access the 4Knob Upright interface?

I’ve got it working . . . moved things around using the Steinberg Library Manager, and then EDIT in Halion Sonic SE3 brought up the graphical interface.

(Have never used that plugin until now)