How to have a cursor stay the same size regardless of brush size?

Hello everybody,

I'll try to explain myself a little better. I've been watching some tutorial videos from Gumroad, and I've noticed that a lot of pros have an interesting setting for their brush cursor: no matter how big the painted area is (and therefore the actual brush size) the cursor's size stays the same. For ex:

you can see in this tutorial from gui guimaraes that his line is actually pretty thin (8 pxls) while is brush cursor remains big, but also becoming pixelated to show how it would actually look if it was that size. It's an interesting setting and I've been wondering how to get that.

Am I making sense? Let me know if you need additional info.

Thanks!