[libreoffice-users] Export to ePub

Good afternoon
Windows 10, LO 7.6.6.3
I have published in the past a book in Japanese as an ebook.
Now I have revised it and want to upload the file, but the publisher 
(Draft2Digital) tells me, it HAS to be in epub3 for Japanese texts.

Well, I tried to find how to export odt files to epub and the 
documentation for 7.6 says:
file:///C:/Program%20Files/LibreOffice/help/en-US/text/shared/01/ref_epub_export.html?DbPAR=SHARED#bm_id3149532
"To access this command... From the menu bar:
"Choose File - Export As - Export as EPUB."
Then there is a link to an image:
https://wiki.documentfoundation.org/File:7603EN_Writer_Dialog_EPUBExport.png

Problem:
THAT is NOT what I have on my screen.
Having a choice between epub versions and other options would be great, 
but I have only:
Choose File - Export As - Export as EPUB -> choose file + save as epub.
That is all.
If it is possible to get all the options shown in the image 
"https://wiki.documentfoundation.org/File:7603EN_Writer_Dialog_EPUBExport.png"; 
would be a life saver. Maybe.

Currently the publisher does not accept the odt file or an epub file (I 
tried a million times also with other software)

Is there a trick to get all those "Export as ..." options?
Thank you.
Thomas

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