Hello Eugene Eng,
Thank you so much for using our theme SuperMagPro. As per your questions, please follow the below steps to show Home Main Content Area
1. Create a page. Example: Home
2. Create another page. Example: Blog
3. Go to Settings > Reading > Choose on A Static Page
4. Select the Home page for front page and blog for blog page.
5. Go to Appearance > Customize > Widget and you will get the home main content area there.(Refresh your site if not appeared)
Hope this will solve your issue. Please follow the theme documentation for better solutions.
Best Regards,
Acme Supports