Or maybe make it an option? If a hex is fully settled and the manual number inside it is 0, it's completely useless to keep seeing that 0.. Even faded out I'd still manually remove them I think.. OCD and all :P Kind of in the same realm as when special hexes are fully settled, they stop showing up purple on other hexes when you right-click on them, since they don't contribute anymore
Edit: It's not a huge deal though.. Very minor QoL thing