c/n edit out or delete some bookmark entries

Thank you Philip.. I should have mentioned I tried to edit it out using the
dialog box without success.. the wrongful uneditable entries remains
no matter my attempts to remove them by either of the means you
suggest.

I think i need to know the ¨file location¨ of the entry to see if it can be
edited out using the command line at a shell interface in Ubuntu or
maybe some other editing tool? Its like the permissions have been
changed, I can see it, but cannot address it or edit it?

Might I suggest making a copy of your document.

Change copy extension to ".zip". Open the xml as a text file and compare lines that work with those that don't.

Could be permissions or length of path.

Sorry, but I don't know which file to look at.

    XML file structure

Documents in OpenDocument file format are stored as compressed zip archives that contain XML files. To view these XML files, you can open the OpenDocument file with an unzip program. The following files and directories are contained within the OpenDocument files:

1. The text content of the document is located in *content.xml*.
    By default, *content.xml* is stored without formatting elements like
    indentation or line breaks to minimize the time for saving and
    opening the document. The use of indentations and line breaks can be
    activated in the Expert configuration
    <https://help.libreoffice.org/Common/Expert_Configuration> by
    setting the property */org.openoffice.Office.Common/Save/Document
    PrettyPrinting* to *true*.
2. The file *meta.xml* contains the meta information of the document,
    which you can enter under *File - Properties*.
    If you save a document with a password, *meta.xml* will not be
    encrypted.
3. The file *settings.xml* contains further information about the
    settings for this document.
4. In *styles.xml,* you find the styles applied to the document that
    can be seen in the Styles and Formatting window.
5. The *meta-inf/manifest.xml* file describes the structure of the XML
    file.

Additional files and folders can be contained in the packed file format.