How to Hide Magazine Blocks Admin Menus

function plt_hide_magazine_blocks_menus() {
	//Hide "Magazine Blocks".
	remove_menu_page('magazine-blocks');
	//Hide "Magazine Blocks → Dashboard".
	remove_submenu_page('magazine-blocks', 'magazine-blocks#/dashboard');
	//Hide "Magazine Blocks → Blocks".
	remove_submenu_page('magazine-blocks', 'magazine-blocks#/blocks');
	//Hide "Magazine Blocks → Products".
	remove_submenu_page('magazine-blocks', 'magazine-blocks#/products');
	//Hide "Magazine Blocks → Settings".
	remove_submenu_page('magazine-blocks', 'magazine-blocks#/settings');
	//Hide "Magazine Blocks → Help".
	remove_submenu_page('magazine-blocks', 'magazine-blocks#/help');
}

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

Where do I put this code?