After you exit a share, you cannot join in the share again. The shared file or folder will still be in other recipients' Onebox. If you are the sharer, you can cancel a file or folder share or remove recipients of a shared file or folder.
Perform the following steps to exit share:
The Shared with Me page displays each time you go to My Shared page.
Alternatively, you can click the blank area to the right of the file or folder and choose Exit Share above the file list.