Thanks for posting your issue.
Well it is some kind of hard code indeed. If you don't not define the "Page Layout" it is "right sidebar" by default. In this situation, without any widget, it will show the default sidebar.
Please try to set the page layout to "Full width" by edit ting the page. You will find page layout in the right column, under the heading "Template options".
Alternatively you can consider to install the Options Framework Plugin, this enables the options to the layout per page type.
Or to set all your pages to "full width" write in your functions.php:
$jbst_layout = 'full-width';
add_action( 'wp_head', 'jbst_set_global_layout');
see also: https://github.com/bassjobsen/jamedo-bootstrap-start-theme/issues/104
Note is you think there is something wrong with the default setting as described above. Please feel free to post an issue on github too: https://github.com/bassjobsen/jamedo-bootstrap-start-theme/issues/new