Why when I double click on a component everything else gets hidden?

So I’m following along with this youtube tutorial.

At the point he clicks on the component to make changes to it everything besides the component seems to fade, but you can still see them.

When I double click on a component to make changes to it everything but the component seems to vanish.

Why does everything vanish when I double click on a component?

Thanks,

Go Window/Model Info/Components and choose how you want it to work.

That did the trick. Thanks Box!