The height of the sidebar is dependent on its content. The same goes to the content area with the blog posts. Unfortunately, the theme cannot automatically remove the widgets from your sidebar in order to make it equal with the content area.
I understand. But I mean, at least, the top of the sidebar. for example I post a banner. I need the top of this picture to stand in a row with left-side articles (actually the 1st row of them). I understand that the height of the sidebar is dependent on its content, but what about the top? it’s a few inches below