While searching for "fcitx" under "All", I would like to see the Home Manager options first followed by the NixOS options and then the Nix packages because that is the general order I tend to use the results in. I think that is a sensible order unless some results are considered better text matches than others which is probably not the case except in the cases of "i18n.inputMethod.enabled" and "i18n.inputMethod.type" showing at the very end.
Alan Pearce referenced this ticket in commit df5db96.