Not sure if I am just blind or the feature does not exist!?
What I mean: You have two graphic “items” in the pipeline which you show in a render view. Now you want to select cells or points in one of the two, but not in the other, so it would be helpful if for the “other” you could turn off the “selectibility” - first of all if it is huge!
Of course you could turn off “the other”, but maybe you need it for orientation purposes during the selection.
Under the Display properties (in the Miscellaneous group) there is an advanced option named Pickable. It is easiest to find by just searching for “pickable” in the search box on the top. I believe that is exactly what you are looking for.
I think “selectable” is the right name for this option. The user-facing name for the feature is selection. All of the controls regarding finding points/cells based on rendered location are labeled with selection (with the exception of this one). “Picking” refers to a specific operation that happens internally in ParaView. (Specifically, it means you do a special “pick” render that writes cell/point ids to the image.) I’m sure that’s how this label got its name, but the name should really match the rest of the ParaView GUI and its documentation.