Problem solved by creating a series of false (dummy) collections so that there is a "last" page collections. This "last" page will be inaccessible, but no matter: ALL collections are false, empty, dummy.
In practice with Calibre I filled the field "tag" with "finction, Z1, Z2, Z2, Z4, Z5, Z6, Z7, Z8" for a single book to which I access the collection "finction".
Many thanks to all
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