Why can I not change the shape of my controller? [Modular Rig]

Hello, I am very new to rigging in UE5 and I hit a roadblock.

In modular rigging, I added a custom control for the jaw, but for some reason I cannot change its shape.


For some reason, the drop-down menu is greyed out. What could I do to fix this?

(don’t mind the halfway German interface, for some reason UE5 changed its language and I’m too lazy to change it back)

The red message says:
“This element was created procedurally.”
When I hover over it, it says:
“You cannot change the settings of this element here. Please change the settings of the Knotpoint, that created this element”

I cannot make much sense of it, perhaps you can

Thanks in advance!
Cheers!