I have a question about scrolling in LibreOffice Writer. When I scroll up or down a document, as soon as I turn the mousewheel, a black rectangle reading "Page 1/4" shows up, on the right side of the document. It stays visible until the cursor is brought on it (then it disappears), or the mousewheel is scrolled again (then it is replaced by another rectangle). I would like to know how to avoid this indicator to show. If you have any clue, I would be grateful. Thanks!