Agent collision detection is a feature that is available to Professional and Growth users that alerts your agents when another agent is viewing and possibly updating the same ticket. This helps prevent agents from trying to make updates to the same ticket at the same time.

Go to Admin > Ticket Settings > Avoid Agents collision

If Agent collision avoidance duration is set to 0 minute i.e. feature is Off. and on the ticket detail page there will be no Agent Collision alert appeared at the top. But if the duration is set to 1 or greater than 1 minute the message will appear “AgentName is typing” with a yellow(any) background.