1) Press the windows key + r to bring up run box
type powercfg.cpl and press enter
click on choose what power buttons do
click on change settings that are currently unabailable
uncheck turn on fast startup and then click save settings
or
2) Settings -> System -> Power & Sleep -> Additional Power Settings -> Choose what the power buttons do -> Change settings that are currently unavailable
Then remove the check from Turn on fast startup (recommended) Then save