Folder - Masks

Folder Thumbnail Mask

In the context of a Folder Thumbnail, a Mask acts like a “cookie cutter” for the icon. It defines the visible shape of the app icons displayed within the closed folder on a desktop.

What it does: It hides any part of the thumbnail that falls outside the mask's shape, forcing the cluster of mini-icons into a specific form (like a circle, rounded square, or custom shape) regardless of the original arrangement.

For a How To create and use a folder masker, see here.