Streaming 3DS games can always be a little tricky to make look good because fitting both the bottom and the top screen nicely can be difficult. This is an idea that ZRuns thought of that I started using. I made a tutorial for how to set up the layout on OBS:
https://www.youtube.com/watch?v=SG0YbWmimqQFeel free to post your own layout/ideas on here so that we can improve the streams of this game.