When the Library opens, only the top level folders appear in the Folders pane. The Folders pane, which appears in the left pane in the Library, displays the folder hierarchy in a tree view. When you select a folder in the folder tree, its contents appear in the Contents pane to the right. 

Expand/collapse symbols (+/-) appear next to folders that contain subfolders. A plus (+) symbol means that the folder is collapsed and the subfolders are hidden in the folder tree. A minus (-) symbol means that the folder is expanded and the subfolders appear in the folder tree.

Note: When selecting folders, you can select a single folder in the Folders pane and multiple folders in the Contents pane.

To expand and collapse folders:

1. Click the (plus symbol) in the folder tree to expand a folder.
    
   You can also double-click a parent folder in the left or right pane to expand it.
    
2. Click the (minus symbol) in the folder tree to collapse a folder.

Note: You can also press ENTER to expand and collapse the selected folder in the Folders pane (left pane) or open the selected folder in the Contents pane (right pane).

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