Hello ,
How can I appear region of listing on the mobile , see the picture please :

@mphker
1) modify search_list.php and add region there (osc_item_region() function)
2) add to responsive.css style to show only on mobiles

sorry ,
but what I add to responsive.css ? I mean what the code ?
can explain in details please .

@mphker
Please, you cannot ask for support on topic you have no idea about.
If you do not have skills for custom development, look for some developer that will do it for you.
We will not provide full code with explanation "Go to this line, place code there, go to this file...", it is development, nothing common with support.