Hello. I'm new to SW, although not to CAD, and I have a newbie question. When I create a new .sldasm, it pops up the Begin Assembly Property Manager, and since I want to work top-down, I click Create Layout. This is supposed to open a 3D sketching environment for me to build the layout. But it isn't doing that, instead it gives me this:

I don't know what that grid is or why it's there. Presumably I