Change Network Adapter to Private via PowerShell

Set-NetConnectionProfile -InterfaceIndex <index number> -NetworkCategory Private

For example:

PS C:\> Get-NetConnectionProfile

Name : savilltech.net

InterfaceAlias : Internal

InterfaceIndex : 12

NetworkCategory : DomainAuthenticated

IPv4Connectivity : LocalNetwork

IPv6Connectivity : LocalNetwork

Name : Network

InterfaceAlias : Internet

InterfaceIndex : 13

NetworkCategory : Public

IPv4Connectivity : LocalNetwork

IPv6Connectivity : LocalNetwork

PS C:\> Set-NetConnectionProfile -InterfaceIndex 13 -NetworkCategory Private