If you are talking about performance; when you launch the game you should get the Unity launcher window. In there you have several options for quality inside a drop down. Depending on the hardware of your computer, you can pick a quality setting that works best. Additionally, inside the game, you can click the gear icon on the top left of the screen and turn off various post-processing features like depth of field or anti-aliasing. When you adjust these in game, you should see the performance change automatically.
I hope this helps :)