How do I add a sidebar in Elementor?
Go to Content > Sidebar > Choose Sidebar, and select a sidebar to display on the page. Tip: Elementor's Hello theme does not come with a widgets menu section or sidebar by default.
How do I remove the sidebar in Elementor?
Go to Appearance > Widgets on the left side of your dashboard. Find the Sidebar area. Expand the widget section by clicking the down arrow. Then, click Delete.