Add Three Column Layout to Genesis Front Page and Two Column for Other Pages

1) Go to Customizer / Theme Settings/ Site Layout / Select Site Layout to Secondary Sidebar – Content – Primary Sidebar
2) Add this snippet to functions.php

// =========================================================================
// ADD SECONDARY SIDEBAR - CONTENT - SIDEBAR - 3 COL LAYOUT TO FRONT-PAGE
// =========================================================================
function add_three_column_layout_to_frontpage() {
    if ( !is_front_page() ) {
        return 'content-sidebar';
    }
}
add_filter( 'genesis_pre_get_option_site_layout', 'add_three_column_layout_to_frontpage' );