Why can’t I get the RIN or identification number column for the people linked to my family tree program to appear on the main list of people?

The option to turn on additional columns of information on the main grid-style listing of people in Clooz (such as RIN numbers, user assigned IDs, etc) is contained in the context (right click) menu when the main list of people is being displayed.   Click on the desired column type to toggle it on or off.

If the option to display these columns is not appearing in the menu, then you have not designated a “Primary” file on the list of External File Links.   Since Clooz can be linked to any number of external files, you must designate which one is to be active at any one moment.   This is done by right clicking the file in the External File Links list, and selecting “Set as Primary”.