In version 3.39, this feature was added: "In the search screen, you can now long press rows in the search results to do collective actions, like Delete, Lock, Unlock and Share as Email."

I just used one of the delete features to select and delete all the search results, but when I returned to Textra and found that the message just deleted is still there and is empty after opening.

Need to re-delete or use Resync Textra, these blank messages will disappear.

Sorry for my bad English.
:)