Quit Lightroom Classic.
You can set preferences to change the Lightroom Classic user interface.
If you reset your preferences without noting your current catalog's name and location, it can appear that your catalog has disappeared when you restart Lightroom Classic. Before you reset your preferences, refer to Recover catalog and images after resetting preferences, which contains steps to avoid this confusion.
When you attempt to restore Preferences and the Store presets with your catalog option is selected, Lightroom Classic will not point to the presets stored with the catalog. It may appear as a result, that you've lost your presets but they are still stored with the catalog.
To resolve this, do one of the following:
Plugins and Plugin Settings
Plugins might go missing after one restores Preferences. To avoid this, store the plugins in the following folder:
Publish plugin settings do not reset as they are stored with the catalog, however, any other plugin settings or presets will be restored to default. Any missing plugin will need to be added to Lightroom Classic after restoring Preferences.
Use any one of the following methods to restore Lightroom Classic preferences to their default settings:
Quit Lightroom Classic.
macOS: Press and hold the Shift + Option keys.
Windows: Press and hold the Shift + Alt keys.
While holding down the keys, launch Lightroom Classic. The following dialog box appears:
macOS: /Users/[user name]/Library/Preferences/
Windows: Users\[user name]\AppData\Roaming\Adobe\Lightroom\Preferences\
macOS: The user Library file is hidden by default. For temporary access to the user Library file, press Option and choose Go > Library in the Finder.
Windows: The AppData folder is hidden by default. To view it, choose Start > Control Panel > Appearance and Personalization > Folder Options. In the Advanced area of the View tab, make sure that Show Hidden Files and Folders is selected. Then click OK.
Drag the following files to the Recycle Bin on Windows or to the Trash on macOS:
Windows: Lightroom Classic CC 7 Preferences.agprefs
Restart your computer and launch Lightroom Classic.
For more information, see Preference file and other file locations | Lightroom Classic.
By default, the presets and templates that you create in Lightroom Classic and your catalog are stored at different locations within the user account folder path on your computer. To know the default locations on macOS and Windows, see 'Presets and templates' and 'Catalog' locations in Preference file and other file locations | Lightroom Classic.
If you use a specific catalog on multiple computers, you can choose to store your presets and templates with that catalog. To do so:
When you enable the Store Presets With This Catalog option, Lightroom Classic doesn't copy or move your existing presets and templates within the associated catalog folder. Only the new presets and templates that you subsequently create are stored in the 'Lightroom Classic Settings' folder within the catalog folder. Clicking the Show Lightroom Classic Presets Folder (Preferences dialog > Presets tab) now takes you to the catalog folder on your hard drive instead of the default location.
Any new presets or templates that you now create after selecting the Store Presets With This Catalog option will be stored in a new folder named 'Lightroom Classic Setting' created within the associated catalog folder.
The advantage of using this option is that the presets and templates are available in Lightroom Classic when you launch the associated catalog on another computer. These presets and templates include Develop presets, Export presets, External Editor presets, Filename presets, Filter presets, FTP presets, Keyword sets, Label sets, Local Adjustment presets, Metadata presets, Print templates, text templates, Watermarks, and Web templates.
See Julieanne Kost's blog post on Storing Presets and Templates with a Catalog.
In the Presets Preferences, click any of the Restore buttons in the Lightroom Classic Defaults area.
Lightroom Classic can display menus, options, and tool tips in multiple languages.
Choose Edit > Preferences on Windows or Lightroom Classic > Preferences on macOS.
Close Preferences and restart Lightroom Classic.
The new language takes effect the next time you start Lightroom Classic.