You can bookmark a document or folder for quick access, and select Favorites from the side bar to view them.
Hover over a document or folder and select the
icon. (Optional) Right-click the document or folder and select 
Add to Favorites, or open it and select 
> Add to Favorites.
The document or folder is marked as favorite.
NOTE:
The icon is displayed next to a document or folder that is marked as favorite.