We use a lot of VPN PPTP Connections. On most we turn off "Use default gateway on remote network". See the image below that shows where this setting is turned off.
We cannot open the properties for Internet Protocol Version 4 on VPN connections under Windows 10. This is located at Network Connections and Properties of a VPN Connection. Networking Tab, then select Internet Protocol Version 4 and click Properties. But under Win 10 the properties dialog does not open.
This has been tested on several Windows 10 systems and we have enabled Administrator and tested under that login as well.