From my understanding you are trying to remove the sidebar area from the main home page, but leave it on all the other pages. If that is your goal then all you need to do is change your page template for your designated Static Home Page.
To do this login to your WordPress.com account and navigate to the Page section and edit your home page. Then from the menu on the right click the drop down for Page Attributes, here you will see a section for Template. There should be 2 options at the bottom that do not include the sidebar. Once you select the template click “Save” and preview your site. Your sidebar should be gone now on your main page : )
If this not what you were trying to do please feel free to respond back with clarification.