How to Disable IPv6 on Android

NOTE: I don't use CactusVPN nor do I know anyone who works there. I liked the simple clean look of the page and the clear instructions on how to disable IPv6.

Sadly, I tried disabling IPv6 about 2 or 3 years ago and while mostly things worked fine, there were glitches, I can't remember the specific failures but I've been thinking about trying it again.