I'm sorry I'm not good at English.

Cutscenes: Have a conversation using naninovel. → Hide the dialog and move or take action on the way. → Have a conversation again using naninovel.
How can I create a scene that uses such a timeline?
Do I need to switch between adventure mode and novel mode each time?

Check the integration guide for examples: https://naninovel.com/guide/integration-options.html

Not sure about the timeline, though. It's probably possible with some additional integration.