In free theme you can’t use any widget on main sidebar and no page template is available.
This setting is available in BizWeb PRO theme where you can use various page templates and can manage sidebars.
If you want to remove sidebar and would like to display page content in full width, will require some modification in page.php file
Please send your website URL and WordPress admin login details at [email protected] so we can check and solve your problem.
there is not any widget