This is only a sample of how the right sidebar can be shown differently on a PC and a phone. None of the menu items or links work. This is the design for the article pages, not the home page.
On a PC, there is a right sidebar.
On a phone, there is a drop down called ‘Site Tree’ that appears above the title of the article. This only appears on a phone. When you click on ‘Site Tree’ on the phone, the same content that is on the right sidebar will appear. If you click on ‘Site Tree’ again, the sidebar content will disappear.