To get the most granular data for the most actionable insights, it is best to train Agents to ensure they always apply Topic(s) to their Conversations. You can also set up a Rule to automatically apply the most detailed sub-topic when applicable.
By default, Conversations can be closed without a Topic, but you can make it a requirement through the Conversation Workflow settings page. In the below screenshot, see how this will appear to Agents when the setting to require Topics is required:
.png?sv=2026-02-06&spr=https&st=2026-06-06T14%3A19%3A18Z&se=2026-06-06T14%3A30%3A18Z&sr=c&sp=r&sig=2pCJiTOsCgfk2kot7TinTbaD1eYwBmDAEqIliQFgbjM%3D)