Khoros Communities 19.12 brings:
New Features
API Updates
Bug Fixes
New Features
Group Hubs GA
Private Messages v3 GA
Enhancements to Search Subscriptions GA
Group Hubs GA
I...
Updated 6 months ago
Version 8.0
Blog Post
jamiemccardle there's a little check box above the "send to" field that says "Send as a Broadcast Message". Make sure you tick that off.
Make sure you've updated your permissions for that user type to allow them to send messages to multiple users...it's more than just updating how many can send at a time. Check your default permissions, too, depending on how you want to set it up.
On your last note, can you be more specific? One message in a conversation with others? Or just one conversation? Which are you wanting to delete?