Essential grid can be make mobile compatible under grid settings as follows
Grid Settings > Column > Mobile:
You may set this to one. Then Maximum Row might be 3.
How to sort Essential Grid pages/posts with page IDs
“Source” tab in Ess. Grid settings has “Type and Category” section. In “Type and Category” there is an option to input additional parameters. Here we can control the view the grid for example post per page, total posts count, serial posts by ID etc.
posts_per_page=4&showposts=6&post__in=array(1,2,3,4.5,6)