There is a security screen lock available for your ThermaTouch. Follow these steps to set it up:
From the Settings menu, select General
Draw a pattern and touch CONTINUE. The pattern must connect a minimum of 4 dots. Note that all users will need to enter the same pattern in order to access the User selection screen
Draw the same pattern again and touch CONFIRM
Don't worry, the ThermaTouch will not lock you out for entering the wrong pattern too many times. You can unlock the control at any time. Just touch the FORGOT PATTERN? button:
Enter password 2015:
This will disable the screen lock
Note that when using Alexa to start a steam or shower session, you will not need the security pattern.