One of our fields in our documents library in SharePoint 2010 has now become REQUIRED, probably due to a mishap on my part. (Now, when we try to edit any document under that library, it says that this field cannot be empty and forces us to enter a value in the said field.)
I can see at several places in SharePoint that the value is now "Required", but I don't see any place where I can CHANGE that back to "Optional".
Can you help me? The simplest way, please, because I'm a beginner.