I have installed signifyd connect extesnion . After installation I got compilation error "Fatal error: Class 'Signifyd\Core\SignifydAPI' not found in app/code/Signifyd/Connect/Helper/SignifydAPIMagento.php on line 12 " . And On admin order grid Mass action and filtering section was not visible . I rechecked the same issues after disabled the same . Then everything works fine .