Saved workspaces contain the target locations to synchronize and can be used as a shortcut to open them without using the folder chooser.
To open a saved workspace, choose Open Workspace from the File menu:
A File Chooser window opens, allowing you to navigate to your saved workspace and open it:
Recently-used workspaces appear at the bottom of the file menu. This is the quickest way to access a saved workspace that you use regularly. Open the file menu, go to Recent, and select your workspace:
See also: How To Save Your Workspace, How to Select Folders to Synchronize.