Widgets can be added to any available widget area you have under Appearance > Widgets.
The layout is dependent on your theme. If your theme has a sidebar, it will call it using the get_sidebar() function on that archive page template or single listing template.
You can create your own custom templates, or for single listings, we have a few templates available for purchase on agentevolution.com.
Check. Thanks. Don’t think one of my themes had a sidebar so I was stumped.