"Custom Columns Technical Listing"
The JS "Utilities" Menu has a tool named "Custom Columns Technical Listing" that shows what the Editable status is.
All Custom Columns are originally a 1 (editable), and can only be changed by two plugins that I know of: JS (via a tool for just that purpose) and ZMI (for #zotero_..... columns populated from Zotero's csv export file).
DaltonST
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