Tips on Customizing WP-AVIM-Reloaded

How to Hide the "WP-AVIM-Reloaded" Admin Menu

function plt_hide_wp_avim_reloaded_menus() {
	//Hide the "Settings → WP-AVIM-Reloaded" menu.
	remove_submenu_page('options-general.php', 'wp-avim-reloaded/wp-avim-reloaded.php');
}

add_action('admin_menu', 'plt_hide_wp_avim_reloaded_menus', 51);

Where do I put this code?

How to Hide the "Bộ gõ AVIM-Reloaded" Meta Box

function plt_hide_wp_avim_reloaded_metaboxes() {
	$screen = get_current_screen();
	if ( !$screen ) {
		return;
	}

	//Hide the "Bộ gõ AVIM-Reloaded" meta box.
	remove_meta_box('wp_avim', $screen->id, 'side');
}

add_action('add_meta_boxes', 'plt_hide_wp_avim_reloaded_metaboxes', 20);