First, open the gallery where you want to view your client’s favorites.

Go to the Settings menu, then scroll down and click on Favorites.

In the Favorites List section, click on the Activity tab.
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Under the Favorite Lists section, you may have more than one favorites list. Select the list that you want to view.
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Under the Selections header, your client’s favorites will be visible. From there, you can actually put those images into a folder inside the gallery.