Why is "overlap" not an option for instance segmentation models?

As per the title - for object detection, “confidence” and “overlap” are parameters when making predictions; however, for instance segmentation, “overlap” is not available. Why is this the case?

If I’m mistaken, how can I adjust “overlap” for my instance segmentation model?

Thanks!

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Just to add that when I downloaded the annotations and trained the model locally using YOLOv8, IoU (overlap) is a parameter and affects inference quite a lot, so curious why this wouldn’t be the case on Roboflow Instance Segmentation inference.