Create new registry key NewNetworkWindowOff in:
HKLMSYSTEMCurrentControlSetControlNetworkNewNetworkWindowOff
Using task sequence this can also be used:
reg add "HKLMSOFTWAREPoliciesMicrosoftWindows NTCurrentVersionNetworkListSignaturesFirstNetwork" /v Category /t REG_DWORD /d 00000001 /f