Comment 1 for bug 1133033

> it takes way too much space (especially in French)

You can turn the filter primitive infobox off completely in the preferences:

Inkscape stable:
Inkscape Preferences > Filters: [ ] Show filter primitives infobox

Inkscape trunk:
Inkscape Preferences > Interface: [ ] Show filter primitives infobox

<option>IMHO the current available options are ok (verbose for new users, advanced users can turn it off completely): I'd rather see development efforts spent on a redesign of the filter editor itself, than adding a minor partial redesign for one minor aspect of the current GUI.</opinion>