Sometimes i think stencils get in the way of seeing how am i doing, especially when i only apply some fine layers of airbrush paint. So i been waiting for a way to hide the stencil, but not lose its effect.
I found one!
If you hold H or V you can work without the stencil getting in the way, but that can lead to trouble navigating and makes the use of other keys awkward. But if you hold H or V and drag the canvas with left click, the stencils remain hidden as long as you hide, then unhide them.
I think it is technically a bug, but in practice it is a feature. Yay for happy accidents!