As you can keep different accounts for all the users of the computer, you can switch between them anytime you want without need to log-out.
To do this, go to the user menu sited in the superior right side of your screen, and chose
To choose another or come back to the previous account, you just need to repeat the same.
Notice that if you have multiple accounts logged-in at the moment that you are trying to
Explain how user switching works, why it's useful, and potential problems (like what happoens if someone tries to shut down when you are still logged in?)