You know the situation: the players have decided that splitting up is a good idea. Maybe they’re on a shopping trip, maybe they’re investigating a dungeon/mothership, maybe some of them were arrested.
What’s the best way to handle the situation outside of combat? How do you keep it interesting for the players, while moving the story forward?
How do you choose when to cut between groups?
Like most of GMing, it’s an art. You get a feel for it based on the players and the system.
Follow one group until there’s a natural break in the action, or their need to make decisions, or just until the other group gets fidgety.