Back when this wishlist was created, detection zones only had 1 single box shape that could be created as a detection zone. So people were asking for more than 1 single box shape. Wyze updated their detection zones to have a grid of several little squares (for example, the V3 should have 9x16 squares in a grid, for a total of 144 boxes that can be selected on or off).
You should definitely see that in the V3 cam, but if you are not seeing that in the detection zone, there are a handful of people recently experiencing a bug Wyze is working on:
And that should be resolved for those few people soon.
Again, your V3 should definitely be showing up as a grid though.