Locating code run when game starts

Hi,

When the game starts, several things are generated in the world outliner such as a camera manager and other things without me having written code to do so. Where is the code to make this happen so I can access certain elements and stop others from being created?

You just need to make changes to the game mode created by default according to the template you choose at time of creation. You can find it in Project Settings > Maps and Modes