Override Pagebuilder Widget template.

widget_filters.php

<?php

function mytheme_feature_widget_template( $filename, $instance, $widget ){
    $filename = get_stylesheet_directory() . '/partials/feature-widget-template.php';
    return $filename;
}

add_filter( 'siteorigin_widgets_template_file_secondthought-feature-widget', 'mytheme_feature_widget_template', 10, 3 );

?>