Device controls can be found Lab Device operations dropdown menu on the Lab toolbar.

If a lab contains several devices, you can perform the same operations on all devices within the lab with commands.
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Power on all devices
Powers on all devices.

Power off all devices
Send a shutdown signal to all devices in the lab (device progress will be lost).

Refresh all devices
Refresh the connection and state of all the devices in the lab.

Reboot all devices
Send a reboot signal to all devices in the lab (device progress saved only whilst in the lab)

Reset all devices
This will reset the devices back to their original state and any changes made during this session will be lost.