Why does this grey box appear on left of screen?

Hum… that’s a bug. Or at least a UI with no function yet. Is it showing always?

I have build Bike with a sidebar UI, but I’m not yet using it for anything. I didn’t think I had added anyway to show it, but it looks like maybe you’ve found a way. How did you show it?

in full screen mode i move the cursor all the way to the left and it consistently appears. i would love to be able to use this!

Sidebar in Bike would be a marvelous thing! Hope you have a dozen use cases in mind!