In the left pane, click Choose what the power buttons do.
In the next window, click Power Options.
When the Control Panel window has opened, go to the drop-down list next to View by.
On your keyboard, ssthe Win + R key combo to launch Run.
This fix is available for all versions of Windows 10 and is not as complicated as it may seem. Option one: enable sleep mode via Control Panel As we’ve mentioned above, there are three main fixes for the missing sleep option issue in Windows 10.