In this old thread asking for the same thing, it is mentioned that this can be accomplished with restriction settings in the controller:
Looking at the restriction settings, the wording is a bit confusing (seems like it's saying the controller is restricted to only running at these times (is the mentions of the scheduler instead of controller a typo?) but then there is an option to turn off the thermostat when it's restricted, which is the opposite of running.
If I enable "Turn thermostats off when restricted", then is the controller only ON during the specified starting/ending times and OFF all other times? That would do what I want. But if it's the opposite, then it wouldn't work for me since I have separate schedules for weekend and weekday.