Not sure about this theme in particular but usually you can edit the widget function in functions.php. Best to create a child theme to do it and modify it there.
Something like this
'before_widget' => '<aside id="%1$s" class="widget %2$s panel panel-default">',
'after_widget' => '</div></aside>',
'before_title' => '<div class="panel-heading"><h4 class="widget-title panel-title">',
'after_title' => '</h4></div><div class="panel-body">',
) );
You will need to remove the widget area then add it back in the child theme.
This explains how to remove it
https://codex.wordpress.org/Function_Reference/unregister_sidebar
You can copy the function in your theme to add it back.
Hi Suraj jadhav,
I hope you are well today and thank you for your question.
You can try achieving this by using the solution posted in the following reply.
https://colorlib.com/wp/forums/topic/change-sidebar-into-pannels/#post-44919
Best Regards,
Movin