Thanks for your reply.
So, I left aside this version of Grammalecte and installed the one from LibreOffice extension here:
https://extensions.libreoffice.org/e...aires-francais
The version of the dictionary dates back from 2017 but should be fit for the purpose.
Indeed it installed nicely using strictly the Preferences folder and oxt install procedure.
When I opened one ePub, and asked to check spelling, though it did appear to work, it did not filter enough the unknown words. I got a huge list of words,
most of them correct. So, for this reason, I can't make any use of this list.
Here is one example with the joint screenshot. Nearly all the words that appear on this screen have a correct spelling.
To be more precise, if I click on the place designated with the arrow, it does not make any change to the list. I should see most of the entries disappearing. They
all stay put. No filtering. These things had been working with the 3. series version of Calibre since as far as I can recall.
P.S. I noticed in my .config folder, I ad
.config/calibre/dictionaries and other regular items
and
.config/calibre/calibre/dictionaries and what seems to be an older double of the regular items
I guess the top installation is the only one to be used and I did scrap the second one but it changed nothing to the results above. No filtering.