Question / Help How do I change scenes with the scene switcher for League of Legends?

[Krisko]

By default, OBS has a built-in Scene Switcher.
But the problem is I don't know how to use it.

I want to have one of my scenes, "LoL In-Game" which captures my game client, to appear when my client launches.
When my client closes, it can switch back to a scene called "LoL Pre-Game" where it captures my monitor.

How do I do this? Thanks.