How do I lock the Honeywell T6 thermostat to prevent unauthorized changes?

The T6 Pro thermostat offers two screen lock settings: Partial lock (only temperature can be changed) and Full lock (no access without a PIN). To apply a lock, touch Menu on the home screen, use the arrows to select 'SCREEN LOCK,' touch Select, choose your desired lock setting, and touch Select again. A PIN number will appear on screen—write it down and keep it safe. Touch Select and confirm by touching Yes. A lock symbol at the bottom of the screen indicates the thermostat is locked. To unlock, touch the lock symbol, then use the arrows to enter your PIN code.