You have the WordPress function is_front_page() that you need to invert with “!” .
if(!is_front_page() && in_category( array(10,11,12,13,14,15,18,19,20) ))
You have the WordPress function is_front_page() that you need to invert with “!” .
if(!is_front_page() && in_category( array(10,11,12,13,14,15,18,19,20) ))