Hello All.
Coming across your post has reminded me of the technician who recommended using white duct tape or white vinyl tape to mask off regions of the lens on the outside of an old analog motion sensor without having to take the sensor apart. For those not interested in dismantling things this is probably a good option.
Below is a picture of an external sensitivity reducer (not a region masker) for an earlier Wyze motion sensor that I made from the plastic of a milk carton. Also, this motion sensor is aimed to reduce street traffic activation.
A piece of carton plastic, if placed within the new Wyze sensor may also be a sensitivity reducer. But to mask off sensor regions some IR opaque and appropriately positioned material is needed
I like your method because it presents an unadulterated appearance.
Victor.