Visible Message Actions purpose
What is the Visible Message Actions configuration for? I checked Spam (Delete was already checked) thinking it might make a Spam icon visible when messages are marked in the message list or when a message is being viewed, but I didn't see anything at all that seemed to have appeared as a result of checking that item.
Gear Menu > General Settings > Display > Messages > Visible Message Actions
Thunderbird for Android 8.0b1 Samsung Galaxy S21 Ultra 5G/Android 14/One UI 6.1