If I click the spot circled in red below, it will hide all of the objects in the scene. Okay. But now if I click that icon again, nothing happens. I can't "show" all the objects in the scene, only hide them. Every time I accidentally click this, I then have to unhide everything in the scene one at a time with their individual icons. I can't find a combination of clicks/buttons that allow that top-level icon to show the items. What am I missing?