During a session, if the front panel screen is idle for 30 seconds, you are
returned to the home screen. After another 30 seconds, you are logged out of the
session. You can change the length of time before you are logged out due to user
inactivity.
From a web browser, open the Lexmark MFP device web page:
http://device_ip
Go to Settings > Device.
Under Screen Timeout, enter the new value, in seconds,
for the timer. The default is 30 seconds.