To change the display of your album, you have to click on the Display option, located at the bottom right part of the album cover.
It will show a list of display options:
Grid (between 3 squares to 6 squares)
Mosaic (between 3 rectangles to 6 rectangles)
List
You can decide to make this display global to all the albums or for this album only.
Displaying your photos in a Grid view
Displaying your photos in a Mosaic view
Displaying your photos in a List view
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