Change tablet media query site-wide

Hi,
I searched the forums but couldn't find an answer which works. I would like to change the tablet breakpoint site-wide. It's now at 1024px but I would rather have it at 1280px for example.

I found

add_filter( 'generate_media_queries', function( $queries ) {
    $queries['tablet'] = '(min-width: 769px) and (max-width: 1024px)';
    $queries['mobile'] = '(max-width:768px)';

    return $queries;
} );

But changing the 1024px here to 1280px doesn't seem to work when putting this in the functions.php.

Could you please help me?

Regards,
Marco