I've loaded an example file from the help pages which uses the RBD Cone Twist Constraint Properties sops node.

When I select the RBD Cone Twist Constraint Properties node and hit return in order to make edits I am told to select one or more constraints.

No matter where or how I click in the viewport I am unable to select or deselect any constraints whatsoever and I've been unable to find any information on how to actually select one of the existing constraints.

I can use the command Ctrl+A to select all constraints, but then there is no way to deselect them again.

Maybe there's a bug in here somewhere, but I would've imagined that you could just click on a constraint to select it and click off it to deselect it.

OK… so I figured it out … you have to toggle the Secure Selection button.

you can try to setup different Groups

in my example
Group 0 1
Group 2 3

benek
OK… so I figured it out … you have to toggle the Secure Selection button.

Or hold down "S" key and select the constraints you're after.