I have a SharePoint Online list that has recently grown to over 5000 items. Here is what a given entry looks like on the AllItems view, with the column I'm interested in circled in red:
When I go to the List Settings, however, that column is not available:
Nor is it available in the list of columns I can create an Index on.
The list items are added via an InfoPath form, but I can't see any field or column related to 'Approval Status' in InfoPath, nor can I find any automated column additions in SharePoint Designer when looking at the site's various workflows.
How does this list have a column that I can't see, and how can I make it show up so that I can edit it? I understand I won't be able to index it if it's an options list, but I need to be able to see it, at least. I am a site collection administrator and also a SharePoint Online admin.