free online storage after setting up WebDav

Hi, I have setup WebDav and it's working well.
I see that myLibrary is still using 250MB of online storage (from before I setup WebDav) and I was wondering how can I free this space? I need it for a small group library (since groups don't work with WebDav). Not sure how to identify items that are stored in the zotero default storage space and get rid of them (or move them to WebDav in case they are not there yet)?

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