How to Hide BlockArt Blocks Admin Menus

function plt_hide_blockart_blocks_menus() {
	//Hide "BlockArt".
	remove_menu_page('blockart');
	//Hide "BlockArt → Dashboard".
	remove_submenu_page('blockart', 'blockart#/dashboard');
	//Hide "BlockArt → Blocks".
	remove_submenu_page('blockart', 'blockart#/blocks');
	//Hide "BlockArt → Products".
	remove_submenu_page('blockart', 'blockart#/products');
	//Hide "BlockArt → Settings".
	remove_submenu_page('blockart', 'blockart#/settings');
	//Hide "BlockArt → Help".
	remove_submenu_page('blockart', 'blockart#/help');
}

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

Where do I put this code?