1. Open https://github.com/JabRef/jabref-demonstration-libraries/blob/main/chocolate/Chocolate.bib
2. Select all entries (e..g, Ctrl+A)
3. Edit -> "Automatic field editor"

Tab "Clear content" has checkbox "Show only set fields"

• Remove checkbox at "Clear content" - and activate the functionality for that tab
• Add the checkbox to "Edit content" - and have it activated on load
• Add the functionality to "From" at "Copy or Move content" (no checkbox, just list set fields)
• Add the functionality to "Rename field" (no checkbox, just list set fields)