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=2022-11-02&spr=https&st=2026-04-03T17%3A46%3A05Z&se=2026-04-03T17%3A57%3A05Z&sr=c&sp=r&sig=YBzTt9jLZy8cSKuGsBuOlnyLPn%2BmVrrV0VI9Nvyh%2F%2BE%3D)