Quit Lightroom Classic.
When you reset Lightroom Classic's preferences, the name and location of the current catalog is reset. When you start Lightroom Classic after resetting your preferences, locate the appropriate catalog. Otherwise some or all of your images will be missing.
Write down the name and location of your current catalog before you reset your preferences. In Lightroom, choose Edit > Catalog Settings > General (Windows) or Lightroom > Catalog Settings > General (Mac OS). Your catalog name and location are listed in the Information section. You can also click the Show button to go to the catalog in Explorer (Windows) or Finder (Mac OS). Before you reset your preferences, write down the current catalog's location and name.
To reset your preferences, do the following:
Quit Lightroom Classic.
Navigate to the preferences file:
For the location of preferences files in earlier versions of Lightroom, see:
Drag the preferences file to the Recycle Bin (Windows) or Trash (macOS).
When you start Lightroom Classic after resetting preferences, it might ask you to upgrade your catalog. Follow these steps to get your correct catalog back.
If you've been working in a catalog, do not choose Upgrade. Instead, click Choose a Different Catalog.
Note: Choosing Upgrade converts the catalog you used in your previous version of Lightroom Classic to the current version. You probably already did this step when you installed the most recent version of Lightroom Classic. Doing it again doesn't display your current photos, and many files could be missing.
The next dialog box that appears lists the catalogs that Lightroom Classic sees initially. If your catalog is not on this list, click Choose A Different Catalog.
Make sure that you don't choose a catalog here that is not your actual catalog. If you do, you could see differences in the images in the catalog and the edits to some of the images, and missing photos.
Note: The catalogs you see listed could have different names from what is shown below.
In the Explorer (Windows) or Finder (Mac OS) window that appears, navigate to the location in which you saved your current catalog. Select that catalog and click Choose.
The catalog you chose is added to the Select Catalog window, at the top of the list. Select that catalog, and click Open.
If you always want to use this catalog, select the Always load this catalog on startup check box. It's probably best to select Test integrity of this catalog also.
If you skipped the first section of this document (Save your catalog information before you reset preferences) and don't know the name of your catalog or where it is located, try the following:
Look for these things to help you determine which catalog to use from now on: