In Verizon Messages on Galaxy S8+, Android 8.0.0, when i swipe left to delete a conversation to delete it, the prompt pops up and I click delete, but the conversation doesn't delete. This happens more than half the time. I have to go into the conversation, click the Delete icon, select all messages, and confirm the deletion. This was an issue on my S6, as well.
A setting I can change, or does Verizon need to fix their app? My guess is the latter.