In English, LR calls a pile a "stack".
If you're missing the numbers in the filmstrip (the row of photos along the bottom), then first increase the size of the thumbnails by dragging the top of the filmstrip up as high as it goes. If that doesn't help, then make sure Preferences > Show Stack Counts is checked.
If you're missing the numbers in the Library grid of thumbnails, then make sure View > Grid View Style > Show Extras and > Show Badges are both checked.
Thanks a lot I've inadvertently reduced the size of the film strip...
Now it works!
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