I was interested in this also. It seems you cannot disable extensions that are “Bundled with LibreOffice”.
From libreoffice users email list:
…Clicking that button will open a Dialog for configuring the extensions–including the Remove or Disable buttons if applicable–but those buttons won’t be present for the bundled extensions.
[libreoffice-users] Re: installing and removing extensions? - The Document Foundation Mailing List Archives
Several bugs exist where the user says, “And there is no obvious way to disable them via the user interface, so I can’t try disabling them to see if that solves the problem.”, or they specifically mention it is not “Bundled” , but there is no specific bug report or request.
The Libreoffice Manual , isn’t real clear on this. Chapter 14 - Customizing LibreOffice, says “Several extensions are shipped bundled with LibreOffice and are installed with the program. These can only be removed by changing the installation options.”
It seems like extensions shouldn’t be bundled but separate packages and “Installed for current user”.