Okay, you can also mark your replies private if you want to (checkbox under this text input “Set as private reply” in blue text).
Those filters are not printed by our plugin, it is probably a theme feature, so you may have to ask about that functionality from the theme author.
Also not, that combinging two separate search and filters plugins may not work – so if the search was triggered via our search bar, the filters may not work in that case, as there are additional query argument, which may not be recognized by that filter – as it very likely uses it’s own search feature.