Getting rid of a document embedded with "Insert section"

In Ubuntu Linux, instead of a file path I pasted another document as “Insert Session”, which is offered by default.
Now neither Back works, nor can I see any way to delete the embedded doc. This clearly is a bug, but currently I’d just need to fix the document to what it was…

Hi

If the link was created by InsertSectionLink, you can remove by FormatSection▸select the section▸click Remove.

The linked document will be embedded.

If you want to delete the link and content, a “trick” is to rename the linked document before you open the document containing the linked section. The content will not be found, remove the section…

Regards