Hi, this is just what I was looking for! But unfortunately it does not seem to be working for me. I'm using the latest version on GMS2 on steam: 2.3.3.437 And I picked 2.3+.
When I launch the demo, there's a popup with an exclamation mark, the app still loads but it comes up behind the GMS2 editor window so I didn't see it right away. But when I found it it did not have the border, I pressed 1 to open it but that didn't do anything.
I might try getting an earlier version of GMS2 from there site and try that, but if you have a fix for me that would be great! :)