Can you please try signing out of the extension (by clicking on the sprocket to the right of the search bar), and then signing back in? That should move the "x" to the proper place so that you can open and close the sidebar as you would like.
Can you please try signing out of the extension (by clicking on the sprocket to the right of the search bar), and then signing back in? That should move the "x" to the proper place so that you can open and close the sidebar as you would like.