Run "powercfg /a" at an admin command line.
Confirm whether your system firmware support Standby (S3).
Open Group policy editor:
Computer Configuration -> Administrative Templates -> Windows Components -> File Explorer
Enable Show sleep in the power option menu
Computer Configuration -> Administrative Templates -> System -> Power Management -> Sleep Settings
Enable Allow standby states (S1-S3) when sleeping (plugged in)
Enable Allow standby states (S1-S3) when sleeping (on battery)
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