Hey, try asking here, they are more likely to be able to help: https://wordpress.org/support/plugin/elementor/
When you see ELM next to a page name in your WordPress dashboard, it indicates that the page was created or modified using the Elementor plugin. This is a convenient way for WordPress to keep track of which plugin was used to create or edit a particular page.
If you were to deactivate the Elementor plugin, the pages you created or modified using the plugin will still remain in your WordPress site. However, you will no longer be able to edit those pages using Elementor or any of its features. Instead, you would need to use WordPresss default editor or another page builder plugin to make any further changes.
Regarding your issue with menus, it is difficult to provide specific advice without more information about the problem you are experiencing. Nevertheless, if you are having difficulties with Elementor, you may want to consider reaching out to the Elementor support team or community for assistance. They may be able to help you troubleshoot any issues you are facing and find a suitable solution.
Moe – THX for reply re deleting/deactivating ELM.