You can flip between List and Gallery views from the Options menu next to the group name. Galleries are best for groups with each person having a photo, as in the Favorites group on the left. Here are the three top use cases for Galleries:
To organize photos. Tap the caption under the image. It will open the "Add photo" menu with three options: Take a photo or selfie, Add an image from the Photos apps, and Find the photo on the web.
As a visual speed dial. Tap the photo to open a folder and tap an app icon you'll use to contact this person the most. From now on, this icon will appear in the lower right-hand corner of the photo.
To refresh face memory. Comes in handy before large family gatherings, class reunions, company-wide meetings, or other events with people you know. Peruse the Gallery a few times before the event to avoid the embarrassment of not recognizing a big boss, a former friend, or a distant rich uncle.
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