Hi, so we spoke with Elementor about the second issue on editing the shortcode and they said this:
Hi, Thank you for the reply.
The plugin you are using is a shortcode builder, so they [Classifieds plugin creator] should be able to assist you. The shortcodes generated through Elementor for templates and such are default and cannot be changed with our native settings.
Accessing to the directory is usually available through a file manager or your hosting server FTP. That plugin is not our own, so I cannot direct you within their system, you should contact them and ask which file you need to access to edit the shortcodes of that plugin.
My apologies for the inconvenience.
I will close this ticket for now, until you contact them so you won’t get notifications, if you have any further information you can reply to this thread and the ticket will reopen. – Tal”