Harmony hub power off

I just got a hub and wanted to make an activity to turn off all the home theater components. My kids leave stuff on upstairs all the time and I would like to add it to my good night routine to turn off all HT components.
I have looked in the Harmony app and all it lets me do it make activities that turn things on and then turn them off when you switch activities. I just want to send off commands to the devices


I believe by default, there is an all off activity. I don’t remember exactly, but in ST I have it as an option and it’s not a listed activity in the harmony app