Not able to switch between timelines...

Hi there,
I'm pretty new to Resolve (I'm using version 15), and I've run into an issue with timelines that I'm having trouble finding information on. I understand being able to access timelines from the Media Pool, but whenever I create a 2nd timeline in a project, the default timeline that I did not need to create and was there by default I can't figure out how to switch back to. There's no shortcut in the Media Pool, and I'm not finding an option in the Menu settings either. How do I go back to the original top-level timeline?
I'm pretty new to Resolve (I'm using version 15), and I've run into an issue with timelines that I'm having trouble finding information on. I understand being able to access timelines from the Media Pool, but whenever I create a 2nd timeline in a project, the default timeline that I did not need to create and was there by default I can't figure out how to switch back to. There's no shortcut in the Media Pool, and I'm not finding an option in the Menu settings either. How do I go back to the original top-level timeline?