One of my users added a column/field named Active. She was not aware that it would be flagged a persistent column/field in SharePoint. Now when she adds huge swaths of documents to this library she has to check them all in (the field is not filled in automatically). When I attempt to delete the field it is greyed out.
I found instructions on using PowerShell, but it assumes you have an onsite server (uses
cmdlets not available for SharePoint Online) or older versions of SharePoint (2007 , 2010 etc.).