Windows 10 Sleep unattended idle timeout (Hidden setting)

 This setting controls the timeout before a Windows 10 device returns back to sleep from a WoL or timed event.

Sleep unattended idle timeout | Microsoft Docs

It can be accessed by unhiding it with the following command ran as admin

powercfg -attributes SUB_SLEEP 7bc4a2f9-d8fc-4469-b07b-33eb785aaca0 -ATTRIB_HIDE

Or rehidden with this one

powercfg -attributes SUB_SLEEP 7bc4a2f9-d8fc-4469-b07b-33eb785aaca0 +ATTRIB_HIDE

Once its unhidden it will give you a new options within the advanced power settings profile.