App Structure Properties Window Disappears - How To Find It Again

In Wappler 5.1.1, I’m finding sometimes the App Structure Properties window has disappeared. In my setup it is usually below the App Structure itself in a single column to the right.

I’ve found if you make the width of that right column really wide, it re-appears to the right, and then drops below again and now remains visible when you make the right column narrower.

Not sure if this is a bug, but wanted to document it for others who may wonder where it has gone!