Hey! Unfortunatley there is no easy way to do this.
YOu can open the sidebar.php file and remove line 15:
$nowidgets_left = true;
then all the widgets would appear on the left. The problem is that the right sidebar would then also show all those widgets, so the next step would be to register a unqiue widget area for the right side in includes/admin/register-widget-area.php by adding this to the very bottom of the page: