how to reduce words in post expert

Hi there,

Our pro version has this option in the Customizer.

Otherwise, you can use a PHP function like this:

add_filter( 'excerpt_length', 'tu_custom_excerpt_length', 20 );
function tu_custom_excerpt_length() {
    return 20;
}

Adding PHP: https://docs.generatepress.com/article/adding-php/