To make content available offline you are able to mark folders as offline folders. To do so, select the desired folder in the library and click on “Offline Available”.
A menu window will open where you can choose between the single folder or a folder including all its subfolders. By choosing one of the two options, the folder is now made available offline. You can instantly identify such folders with the green offline symbol.
If a folder is no longer required to be available offline, follow the same steps for making a folder available offline and select the third option “Make folder and all subfolders unavailable offline”.