Documents normally shows only documents that are in standard folders such as Documents or Downloads. You can add extra folders that you want to use from the Search preference panel. You may want to do this if you keep some of your documents in a non-standard location such as another folder on your computer or on an external hard disk.
Open the Activities overview and start typing Search.
Click on Search to open the panel.
Press the button in the bottom-right of the window which will open Search Locations.
Press + to add a new search location.
Select the folder that you want to add and press OK to add the folder.
Adding a new folder to the search may let some of your other applications search that folder. Unfortunately, it is not possible to tell which applications will be affected without testing them.
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