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)
How to import CSV file into wordpress database?
Limit checkbox select
Contact form 7
[checkbox* SelectTree class:SelectTree "Flowering Dogwood" "Red Maple" "Sugar Maple" "Service Berry (Amelanchier Canadensis)" "Service Berry (Amelanchier arborea)" "River Birch" "Elm (Canopy tree)" "Fruitless Sweet Gum (Canopy tree)" "American Linden (Canopy tree)" "American Hornbean (Canopy tree)" "American Hazelhut (Fruit tree)" "Apples (Fruit tree)" "BlueBerry (Fruit tree)" "Pears (Fruit tree)"]
Jquery (Limit select 3)
jQuery(function(){
var max = 3;
var checkboxes = jQuery('.SelectTree input[type="checkbox"]');
checkboxes.change(function(){
var current = checkboxes.filter(':checked').length;
checkboxes.filter(':not(:checked)').prop('disabled', current >= max);
});
});