ndo Hi
This template is built with Bootstrap, in which each section uses a class called .container has a fixed max-width depending on screen size.
An easy approach is that you can force this container to become full width by adding this custom css code:
.container {
width: 100% !important;
max-width: 100% !important;
}
into the file: /templates/ja_magz_ii/css/custom.css (create this file if it doesn't exist now)