When using split tunneling and you are using Microsoft’s PPTP or IKEv2, sometimes during the setup of the VPN, the “Use default gateway on remote network” is enabled on teh VPN adaptor (this option actually disallows a system to use split tunneling).
All you have to do is turn it off and you’ll be able to have your split tunneling. Accessing Internet through your ISP, and accessing your work/personal network documents through the VPN tunnel.
Go to Control Panel -> Network and Internet -> Network and Sharing Center
Select Change adapter settings
Right click on the VPN adapter and select Properties
Double click/tap Internet Protocol Version 4 (TCP/IPv4)
Click on Advanced
Then under the IP Settings tab, uncheck “Use default gateway on remote network”
Then Click/tap Ok all the way back.