You can remove the content from a library item to free space on your storage.

If you create a subscribed library with the option to synchronize library content on demand, only the metadata for the library items is stored. When you want to use the items in the library, you must force synchronization on the items to download their content. When you no longer need the files in an item, you can remove the cached content of the library item and free storage space. To achieve this task use the evict function of the SubscribedItem object.