function plt_hide_solar_calculator_menus() {
//Hide the "Settings → solar-calculator" menu.
remove_submenu_page('options-general.php', 'solarrechner-settings');
//Hide the "Solar Calculator" menu.
remove_menu_page('solarrechner-settings');
}
add_action('admin_menu', 'plt_hide_solar_calculator_menus', 11);