I have an old program that i have not much information about except that it was made with Real Studio (now Xojo).

It embeds a browser supposedly via WebView that identifies as Edge 18 based on Chromium 70.
But it doesn’t support what Edge 18 should support, things like arrow functions, array functions like forEach etc.

While testing around i found that the rendering output i get mostly resembles IE11, not Edge 18. Which is confusing since the Browser identifies as Edge 18 and also the configuration says to use Edge 12 or higher.

Is there a way to make it behave like it normally should?