I see.
Try adding this code:
function excludePostId($query) {
$postIds = array(
66
);
if ( $query->is_home() && $query->is_main_query() ) {
set_query_var('post__not_in', $postIds);
}
}
add_action('pre_get_posts', 'excludePostId');
Replace 66
with the ID of the post.
Adding PHP: https://docs.generatepress.com/article/adding-php/#code-snippets
If you want to hide it in archive pages and search pages as well, we’ll need to modify that code. Let us know.