Answer copied from: Can't change powerplan settings in Windows 10 build v1709
The powersettings dialog itself has not been changed, but the upgrade supprimé all powerplan paramètres but the Balanced one, and it will remember the setting actuellement in use.
Si vous switch vers le balanced one, your old one sera forgotten too.
In order to get them back, vous devez créez un nouveau powerplan first, mark one du 3 templates and give them a name. Par exemple, si vous want to use the par défaut High Performance powerplan, you first have to créer it avant vous pouvez switch to it.
