How to stop sharing?

How to stop sharing?

I've just begun testing Zoho and I've set up a couple files for public sharing.  However, I cannot find a way to turn this back off.  The faq says to select the file and right click, then select 'remove share' from the menu.  When I do this, the menu does not have a 'remove share' option.

Can someone please give me an idea where to find this?

Thanks.