This is „mobile menu“ of live preview (http://corpress.wp.themeforest.createit.pl/) on my Lumia 640:
Custom class of row
When you define custom ID and Class of any row, class has now effect on code (Custom ID works properly).
Setting „stretch row“ does not work. It should set up row to be full-width. One could expect .container-fluid class somewhere but this setting has no influence on code. Content is still in standard width container.
No media management
There si no usage of smaller sizes of images generated by WP. Shortcodes work with original sizes of media only.