The layout of your Base is of great importance in order to save Resources when you are attacked by other players. In order to move a building, tap on it. A menu window and green arrows will pop up. Just tap and hold on top of the building and move it to where you think it is best located. Eliminate Obstacles to make your Base more spacious and build new defenses. When you reach Level 13, you will be able to save your Layouts!
To save or switch your Base Layout, just tap Finca and then the arrow cross button.