I am not sure what changes you want to make. If you want to change the number of columns to other than three, then edit this page – themes/customizr/parts/class-content-featured_pages.php. On line 37 this sets to three colums –
//set the areas array
$areas = array ( ‘one’ , ‘two’ , ‘three’ );
If you want two columns, delete the third, as in –
$areas = array ( ‘one’ , ‘two’ );
The problem then becomes the width of the columns. This is set in the css file for the theme color you are using. For example, in customizr/inc/css/red.ccc on line 6634 span4 sets the width. You can change this to a different span(x) with the width you want or edit the widths on span4, or whatever span(x) you are using.
I hope you are not looking for major changes to the layout. Good luck!
TechDom