Remember you can always create Dynamic Templates for your posts to fully control the post design.
By default the blog post media (image, video, audio..etc) is displayed at the top of your content for singular posts which means if you have a sidebar it would be on the same container as the content. However, the theme does include a Customizer setting which you can use if you want to move the post media so it displays at the top of the page before the content and sidebar.
How To Set Post Media Position On a Per-page Post Basis
If you want to control the media position on a per-post basis this is possible via the Theme Settings metabox.