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How to Hide Missing Menu Items Admin Menus

function plt_hide_missing_menu_items_menus() {
	//Hide "Appearance → Reusable Blocks".
	remove_submenu_page('themes.php', 'edit.php?post_type=wp_block');
	//Hide "Appearance → Navigation Menu".
	remove_submenu_page('themes.php', 'edit.php?post_type=wp_navigation');
	//Hide "Appearance → Templates".
	remove_submenu_page('themes.php', 'site-editor.php?postType=wp_template');
	//Hide "Appearance → Template Parts".
	remove_submenu_page('themes.php', 'site-editor.php?postType=wp_template_part');
}

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

Where do I put this code?

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