P: People tab not available in some regions proximate to restricted locations

When looking at individual photos, click on the Keyword (Tag) icon near the bottom of the right-hand toolbar. Any identified faces will appear at the top of the keywords panel, which will then allow you to name them. For images with multiple people, hover over each unnamed entry in the panel and a rectangle will appear over the corresponding face on the main image. Once a face has been named, it will subsequently appear in the list when selecting the People tab in the left-hand panel.

One thing to note, which might explain why you do not yet see any entries when you select the "People" tab, is that there needs to be 5 instances for any unnamed face to appear in the "People" tab. Once a face has been named, however, it will then appear in the "People" tab even if there are less than 5 instances of that face in the library.