Disable 'Content Title' in all posts from a category

Hi!

I'm trying to disable the 'Content Title' element in all posts from a specific category using the code below:

add_action( 'after_setup_theme', 'tu_remove_title' );
function tu_remove_title() {
    if ( in_category('news') ) {
        add_filter( 'generate_show_title', '__return_false' );
    }
}

I put this code in a plugin following the instructions in: https://docs.generatepress.com/article/adding-php/#create-a-plugin
Also, I'm pretty sure 'news' is the correct slug (and also tried with the category ID) but it´s not working.

Please, help!