formatting / layout problem

Apologies if this has been covered previously, but I may not have fully understood the fix. My primary site uses the ‘Salient’ theme by ThemeNectar. I’m tinkering with your plugin in my dev environment on a local machine. The problem I’m having is that single property listings pages are appearing in full-width, with grey text on a black background, and with the map full-width at the bottom of the listing. See attached.

Can you provide me with some detailed, step-by-step instructions on how to fix this? I’m a pretty low tech user.
Thanks