Gives the camera tracking capabilities.
Press the 'Home' key (default, can be changed with in-game keybinding settings) while any colonist, enemy, animal or item is selected, and the camera will follow them (including furniture and plants - but they tend to not move much). Alternatively, you can click with the middle mouse button on colonists in the Colonist Bar on top of the screen to toggle following.
Does not require a new save game Can safely be enabled/disabled in ongoing saves.