Start LibreOffice. Tools > Options > LibreOffice > Advanced. Click 'Open Expert Configuration'. Search for term GreekCharStyle. Double-click the found item. In that dialog click on Help button.
The text on the 404-page is:
That is an error. Possible causes are:
The page does not exist and must be created.
The page exists, but the Help ID is wrong or missing.
Use the Module, Contents, Index and Search selectors to find the right page.
The following data could be helpful in locating the error:
Help ID: cui/ui/aboutconfigvaluedialog/dialog-action_area1
Hi Regina! Thanks for reporting this issue.
Actually, this problem helps with any option you select in the "Expert Configuration" dialog. The reason being that the Help button is contextualized by the tags they're located inside the ui file.
Considering this, the fix would be to add the HID to the following page:
Hence when the user clicks Help in the dialog you mentioned, this page will be displayed.
Typo in my previous message:
Actually, this problem happens with any option you select in the "Expert Configuration" dialog.
Rafael Lima committed a patch related to this issue.
It has been pushed to "master":
tdf#144133 Fix help target for Expert Config Edit dialog