If you want to sort albums by a specific order or show your favorite albums so they are always at the top of the gallery, you can set the Pins and Priorities for each album.

The pinned albums will always appear at the top of the gallery, whereas the prioritized albums will come after the pinned ones.
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Here is how to sort and moderate your Facebook album Gallery:
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1. Go to Facebook Galleries

2. Acess the Facebook Gallery
3. Click on Select Albums
4. Click Pin for the Albums that you like to be prioritized
5. Select prioritized numbers for the rest of the albums that will follow after the prioritized ones.

Once you are done setting the orders and customizing your gallery please make sure to click Save.

That's it!