[davidfor]

Originally Posted by Leonatus

I set annotations in two books, both in the mainboard of my Kobo Touch, one in English and one in German. Running the plugin shows only the annotations I made in the english book. The only difference between the two books is that the english one is a "normal" epub, whereas I saved the german one using the Kobo Touch extended driver. Is it possible that the plugin doesn't work there? */edit:ah, no, I see that it has been jhust the other way round: the english book is the Kobo Touch extended one, and the german a regular epub. However ...*/

The plugin should be supporting both epubs and kepubs. And sideloaded or purchased versions of the latter.

Is it possible to confine the annotation search to a book that I select ether in the Calibre Library or in the reader's library?

Not really. The plugin does the matching of the books that have annotations to the books in the library. This is a limitation because of the way annotations are retrieved from Kindles and the support apps. For these, the link between the annotations and the books is not as direct as for the Kobo devices and even if it did only get annotations for the selected books, it would still need to process all of them. Adding special code just for the Kobo devices isn't something I'm interested in doing.

and

is it possible to generally remove the annotations in the book itself, by using this plugin or another?

This plugin cannot do it. And I won't be adding it, at least partly for the reasons above. I might consider it for the Kobo Utilities plugin, but there are complications to doing this that makes it unattractive.