To enable Daily Reboot for a device, first go into the Display Group that the device is located in. Once there, select the device in the Displays section.
This will take you to a new screen where you will find the Daily Reboot option.
You can then select a time that is suitable for the device to perform a self reboot.
After that is done, make sure you press the Save button. Your device will now perform a reboot at the indicated time every day.