In previos games when I added a sim from a different family to my sims PP I could click on that sim and it would make that sim and its family the active one. In my current game it's not working. I've checked settings and don't see anything that would account for it, but I must be missing something. What do I need to do to get that very convenient feature working?

It's not the most intuitively named setting.

NRaas > PP > General > Dream Catcher > (Set to True)
You can get to the settings menu from City Hall/computer or by right-clicking on the Cycle Portraits button at the bottom of the panel.

Alternatively, you could use Selector to switch active sims by right-clicking on them. Many love this feature of Selector, but I have to keep it switched off because somehow I picked up the habit of right-clicking to recenter the game camera and I kept switching active households by accident.

Thank you, igazor. I saw that option in PP but since I already had Dream Catcher set in MC I just shrugged and looked for something else. I love that feature of PP. Thank you again. I don't have Selector yet. I'm trying to learn all the features of the NRaas mods I already have before adding any more. Story Progression is going to take a while.