left menu but not active

Try deactivate all the plugins . If you cant do that from admin panel you have to do it by PhpMyAdmin / ftp / file manager of Cpanel.

https://www.ads-software.com/support/article/faq-troubleshooting/#how-to-deactivate-all-plugins-when-not-able-to-access-the-administrative-menus

Hi,

The SSL certificate is usually installed by the hosting provider. I will highly recommend you to contact your hosting provider to first check with them. If it is installed properly then it might be possible that on your existing site there could be few links which needs to be updated. You can do that using any plugin as well.

For your second question WP left panel not showing you should first deactivate all the plugins to find out if it works and even try to switch to the default theme. If it does not works then there might be an issue in the installation. Contact your hosting provider they can guide you on it.

Kind Regards,