I’ve been using Sketchup (free) for maybe ten years. This used to work.
I have a large rectangle that I’m using as a floor in my drawing. It is a component.
I drew a smaller square on it, 3" on a side. I drew a still smaller square 2.5" on a side centered in the first one. I want to push/pull the 1/4" rim. I cannot select the rim area and push/pull does not do its job.
When I select the 1/4" region, the entire 3" square surface is selected. I can push/pull that just fine. That makes a square end solid, I want a hollow square tube. When I do push/pull the entire surface, the drawn 2.5" square stays on the top.
This is really basic, it has always worked fine for me. How do I make it work again?