While working with Unity in this book, I will mostly be using its default layout. If, for some reason, your layout does not look like the earlier screenshot, you can reset it by going to the top-right corner of the window and selecting Layout | Default.

You can customize the layout by clicking and dragging any tab to wherever you want it to be. There are also additional options such as making the Project tab use a one-column layout by right-clicking on the tab and selecting One Column Layout. Sometimes, I like to split the center with the Scene tab on one side and the Game tab on the other, so I can see how things change from a different angle. For those of you with multiple monitors, you may use a monitor just for the game. It's all up to your preferences, but keep your changes in mind, as I'll assume that you'll be using Default.