File permissions are set in Admin-panel > Shared files, by using the "Who can..." fields, or the "Masks" field.

Examples

Make folders not accessible by default

If you want your folders to not be accessible unless you give access to a specific account

• click on Virtual File System > home
  • permissions are inherited, so setting something on the home can affect all the rest
• set "Who can download" to "none"
  • prevent access
• set "Who can list" to "any account"
  • otherwise you cannot even enter the home page
  • because of any-account, you will automatically get the login dialog. If you don't want that, you can set "anyone" instead.