At the moment, there is a cap on sensor range of 15 parsecs (tiles) because the FOW code really bogs down the framerate once you get past the 15 parsecs limit. I’d like to fix this someday, but it’s one of the more low priority items.
I saw this in the modding doc, would it be possible to have an override to this, e.g. in one of the xml files so we can override the cap of 15?