Model is gone in free version

After learing how SketchUp works I creating a small project.
I don’t know why know I can not open it.
I can only see the Coordinate cross but when I scroll the mouse nothing happen.

Pergola.skp (468.5 KB)

Tap shift with z.

Your model has been saved upside down, the blue axis is pointing down.

As suggested by Box, after using Zoom Extend (Shift Z), save the model.

I tried to click Strg+Z