1. Select the Library option from the toolbar at the top.
2. Choose Preferences, then select the Manual Configure tab.
3. Notice that any folder with a red box means a subdirectory is being shared. Browse down the shared subdirectory by clicking the + next to any red box until you find the red box with the check indicating the shared directory. Uncheck every shared directory to disable uploading.
4. Notice that no shares remain once all red boxes are unchecked.