There are several buttons which allow you to log out of the application. This will sign you out of your account. You will need to sign back in (with your email and password) to launch the application again.
Note: If you leave the application open for an extended session or overnight and return, you may need to sign out and back in as your license token may periodically expire. The previous session’s settings (Solar Results, Codes and Glazing Types) will however be saved and you may continue with model analysis.