Khazar, that is actually the map's border, not the influence ring. You can only see it when you touch it (with the camera, when you move further outside of a map) and if you don't pause when it appears it just appears for 2-3 seconds. Wherever it appears, only the part you touched is going to be shown. To make it appear like he did, you pause the game and go on a trip to hit every single part of the limit. When you zoom out, it'll look like the picture he showed. When you unpause the game, you'll see the entire wall slowly fading. If you look at a part of the wall in-game while paused, you'll notice that it actually is a sort of mosaic of purple and green flames.