How do I access other catalogs in LR classic.

Steps are given below-

Choose File > Open Catalog and select the catalog that you want as the master (or primary) catalog. This is the catalog you want to add photos to.

Choose File > Import From Another Catalog and navigate to the catalog that contains the photos you want to add from. Then, click Open (Windows) or Choose (macOS).

In the Import From Catalog dialog box:

Under Catalog Contents, select the folders that contain the photos you want to import.

Specify how you want to handle new and existing photos. For more information on these options, see Import photos from a different Lightroom Classic catalog.

Click Import.

Repeat steps 1 – 4 for additional catalogs or photos that you want to add to the open one.

This may help you,

Rachel Gomez

In LR Classic, go to the File Menu, and choose "Open Recent." You should see a list of the most recent catalogs, and you can pick one.

If the catalog you're seeking isn't in that list, you can choose the File Menu, and select "Open Catalog," which will allow you to brose to the location of your catalog file and choose it directly.

Finally, if you know where your catalog file is located, you can find it in Windows Explorer (Or MacOS Finder) and simply double click the .lrcat catalog file to launch LR Classic with that catalog.