When I select my custom column and click the "i" button I'm presented with a pane headed "Edit a custom column".
In that pane I can see:
1. "Lookup name", which already has the column/category name inserted.
2. "Column heading", which already has the column/category name inserted.
3. "Column type", which is greyed out and unavailable.
4. "Show checkmarks" which is an unchecked checkbox.
Any ideas?
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