Both the 'delete' button and in the menu options do not delete messages but change them to unread. How can I remedy this?

The delete function seems to no longer work in Thunderbird. Both the 'delete' button and in the menu options do not delete messages but change them to unread.
I have tried to fix it by deleting the trash / deleted files as suggested in another thread but it made no difference. The delete key still works to delete things outside of Thunderbird (including here for example).
I have not uninstalled / reinstalled. I have rebooted a couple of times and it hasn't made any difference.
I did go through and delete a huge number of old emails a few days ago, but I have cleared out the Deleted folders and it made no difference.
All suggestions appreciated.

Right click on any of the other right panel headers  in Slideshow module to open the context menu. You should be able to reactivate the Options panel from there.

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