how to hide or disable some part in specify page

Question

You want to “reverse” your logic, in a sense. You need “not (home or front)”, not “not home and not front”. For example:

// var_dump(is_home(),is_front_page(),(is_home() || is_front_page()),!(is_home() || is_front_page())); // debug
if ( !(is_home() || is_front_page()) ) {
  echo "Hello World";
} else {
  echo "Else World";
}

An easier, more readable way to write the same thing is:

if ( is_home() || is_front_page() ) {
  echo "Else World";
} else {
  echo "Hello World";
}

Please be aware that theis_home() and is_front_page() functions can be confusing.