If you use OneDrive for work or school, you can delete a document library in SharePoint for a site you own, even if you've already shared documents from that library.
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Select More libraries in the left pane under Shared libraries, and then select Go to SharePoint.
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Under Shared libraries, choose the site that contains the document library to remove and select Go to site (in the upper-right).
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In the left pane of the site, select Documents and go to Settings > Library settings in the upper right.
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Under Permissions and Management, select Delete this document library > OK.