Easier Mentions in Post to Chatter Actions
We’ve simplified the way you mention users or groups in Post to Chatter actions. Instead of inserting mentions with a separate field, just use the @ symbol to add mentions directly to the message.
For example, type @Will in the message and then select the matching result (1).
Previously, you inserted mentions into a message using the Insert @Mention field (2). Now you can add mentions directly into the message area.