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How to Hide the "List Category Posts" Admin Menu

function plt_hide_list_category_posts_menus() {
	//Hide the "Settings → List Category Posts" menu.
	remove_submenu_page('options-general.php', 'list-category-posts');
}

add_action('admin_menu', 'plt_hide_list_category_posts_menus', 11);

Where do I put this code?

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