Why is it when I'm sitting in the car, looking at the manual, trying to find this its not listed that I can find.

While i'm in the Mustang doing nothing. Or sitting waiting on my wife to come out of the grocery store.
I get a message saying that my mustang is shutting the motor off.
Its hot outside and I don't want the motor to shut off.
How do you turn this feature off. I can't find it in the book or non of the setting.
Would like to turn this feature off.

Thanks.