Adc t2000 mode issues

I have two Adc t2000 tstats. On one of them it allows me to select between off. Cool. Heat. And auto.

On the 2nd one it only has off. Heat. And cool. Is there a setting I need to change to enable auto?

I’m not aware of any setting which would remove auto as an option in ADC. Presumably that is where you are looking, correct?

Can you set it to auto by cycling modes on the Tstat itself?

What is the alarm panel model and firmware you are using?

What are the firmware versions of the two ADCT2000s and which is not showing the option?