1) Open Network and Internet Sharing center via the System tray at the bottom-right corner.
2) Select Change adapter options.
3) Right-click on the network adapter you are currently using and select Properties.
4) Uncheck Internet Protocol Version 6 (TCP/IPv6) and save the change.
That’s it! In order to check whether IPv6 is disabled on your computer, you can do an IPv6 leak test here.