Sidebar on single post?

I have a sidebar on https://pivot-to-ai.com which shows up correctly on the front page.

I cant get it to show up on pages or on single blog posts, e.g. page, post

There is a slider for the home page to switch on the sidebar under “Appearance->Customise->Blog posts”, but I don’t see one for pages or for single posts.

Is there a way to enable the sidebar there?