[libreoffice-users] Compress images

Good morning and again a strange question.
I am writing a little book that is scheduled to be published as an ebook.
The formatting instructions from the publisher (Smashwords) are
exclusively based on the use of Word.
There is a 10 MB file size limit, which my book exceeds due to the
included pictures.

The instructions urge (I did not know that trick) to "compress all
images in the file".
And this works.

IS there something like that in LO?
I saw mentioning of "Presentation minimizer" on the page
https://www.libreoffice.org/features/extensions/
but a search for that extension gives "no results".

Anyway, this is meant for Impress. Is there a trick to do that in Writer?

Thank you.
Thomas

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