If you want to see all the photos in one or more catalogs, here are two easy methods. 

Using the Search tool

  1. From the Organizer panel, check only the Search box next to the active catalogs you want to see. 
  2. Select Search. 
  3. Type ""  (two quotation marks with no spaces)

You should see all the photos in the searchable catalogs.

Using the Filter tool 

  1. From the Organizer panel, check only the Search box next to the active catalogs you want to see. 
  2. Select Filter.
  3. Select New.

Until you change settings on the filter, all the photos in the searchable catalogs will be displayed.