How to Hide Royal MCP Admin Menus

function plt_hide_royal_mcp_menus() {
	//Hide the "Royal MCP" menu.
	remove_menu_page('royal-mcp');
	//Hide the "Royal MCP → Settings" menu.
	remove_submenu_page('royal-mcp', 'royal-mcp');
	//Hide the "Royal MCP → Activity Log" menu.
	remove_submenu_page('royal-mcp', 'royal-mcp-logs');
}

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

Where do I put this code?