@tmstffrd –
If you want to remove an Element from the Elementor panel, then here is one way that I have tried and seems to work without breaking anything. Keep in mind that you will lose the content of whichever one you remove this way, i.e., if you remove the Image element, there will be no more images displayed that were placed using it.
Open \wp-content\plugins\elementor\includes\widgets-manager.php in a plain text editor and then comment out the line ( add two forward slashes, // ) that contains the element (widget) you wish to not be displayed in the Elementor panel
There may be a “non-destructive” way to do this, but I am unaware of it myself. Also keep in mind that changes made this way will probably be overwritten on updating the plugin.
Cheers!
Lyle