Pictures folder displays all my photos (PM 3.3.1)

[Gilles]

Hello,
Happy new feature PM getting pictures folders.
But something wrong I can't solve by myself: I have my pictures folder on my Mac, in it many sub-folders (family, holydays, xmas, travels etc etc); so after import on PM left panel I see my folder and then sub folders, ok, but standing on main pictures folder, all my photos are in preview, instead of having the sub-folders previews (like Apple Photos does). Can't find a preference solving this; thank you for some help (sorry my english, I'm french...)

Edit: same i, each sub-folders, the main one displays all the photos from the sufolders instead of just a preview of each sub-folders.