Filtering entries by GravityView's Approval Statuses on Gravity Flow's Workflow Status page

gk-gravityflow-gv-filter.php

add_filter( 'gravityflow_field_filters_status_table', 'field_filters_status_expired', 10, 1 );
function field_filters_status_expired( $field_filters ) {
    foreach ( $field_filters as $form => $filters ) {
        if ( $form == '185' ) { // CHANGE 185 WITH YOUR FORM ID
            $field_filters[ $form ][] = array(
                'key'       => 'is_approved',
                'text'      => 'View Approval Status',
                'operators' => array ( 'is', 'isnot' ),
                'values'    => array( 
                    array( 'value' => '1', 'text' => 'Approved' ),
                    array( 'value' => '2', 'text' => 'Disapproved' ),
                    array( 'value' => '3', 'text' => 'Unapproved' )
                ),
            );
        }
    }

    return $field_filters;
}