You can unlink the folders that you linked by doing the following:
Right-click the folder to be unlinked and select Linked to iManage > Unlink from iManage. The Delete Folder Link dialog box appears.
(Optional) If you want to unlink the subfolders, select the Remove links for subfolder checkbox.
Select OK. The folder is unlinked and the suffix [Work] is removed from the unlinked folder name.