Sidebar widget

I was playing around with the sidebar widget and after a few minutes I realized I don’t want to use it, the regular sidebar is fine for my needs, I’ve done a bit of hacking to it (and it has been fine for a couple years now).

How do I turn off the default sidebar widget (appearance > widgets? Even when I have deleted all the widgets that I’d dragged over to the left sidebar, it just leave the left sidebar blank when I view my blog, it doesn’t put back in sidebar.php file