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How to Hide the "404 Error Page" Admin Menu

function plt_hide_404page_menus() {
	//Hide the "Appearance → 404 Error Page" menu.
	remove_submenu_page('themes.php', '404pagesettings');
}

add_action('admin_menu', 'plt_hide_404page_menus', 11);

Where do I put this code?

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