Add the following to theme's functions.php file (modify module type if needed):
// Add Support for Alternate Module Styles
add_action( 'it_libraries_loaded', 'it_builder_loaded' );
if ( ! function_exists( 'it_builder_loaded' ) ) {
function it_builder_loaded() {
builder_register_module_style( 'navigation', 'Sticky Navigation', 'navigation-sticky' );
}