The Check Out dialog allows you to extract a working copy of a design from a version control design repository to a local folder, which is then automatically opened in Altium Designer.
The dialog is accessed by clicking File » Check Out from the main menus.
Check out from – use the drop down menu to select a source design repository, or click to open the Data Management - Design Repositories page of the Preferences dialog to add and manage design repositories.
Folders – display or collapse the folder structure of the selected design repository.
Check out to – choose the local target folder (working folder) where project documents will be check out to.