We need some more info to be able to help you, so please have a look at Requesting Help and provide some more details, like a repo for your site? Thanks.
It appears that the config.toml for that theme has a lot of options like where the sidebar is supposed to go and so on. Have you tried tweaking those settings?
From your screenshot it looks like your sidebar is not showing up at all. But in the theme’s screenshots on its page, the theme does have a sidebar so I think it might be settings…