Adobe Elements Organizer 12 - Manual (Page 85)

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Optimizing a catalog helps reduce its size. Consequently, the time taken to open and work with files in a catalog is reduced.
1. Close Photoshop Elements Editor and Adobe Premiere Elements.
2. Select File > Manage Catalogs.
3. In the Catalog Manager, select the catalog you want to optimize.
4. Click Optimize.
Adobe also recommends
Rename a file in the Elements Organizer
Move files in a catalog
Remove items from the catalog
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