Shared Excel 2013 workbooks support edits from multiple users at the same time over a network, but lack many features of regular workbooks, such as inserting pictures or adding new sheets. Whether you want to disconnect all other users, turning a shared workbook back to a regular workbook, or remove a single user from the file, use the Share Workbook window.
Open the Review tab and click Share Workbook in the Changes section.
Select someone from the list of active users and click Remove User to remove a specific user. Click OK to close the window after removing as many users as you want.
Uncheck Allow Changes... and click OK to stop sharing the file and remove all other users.
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Choose Yes to confirm.