Thumb

Reference

Mode:

Sculpt Mode

Brush:

Sidebar ‣ Tool ‣ Brush Settings ‣ Advanced ‣ Brush Type

Similar to the Grab brush, but instead only moves the geometry along the surface (using the area plane). This is useful for grabbing surfaces with a very specific direction, or without making too impactful changes to the overall object shape.

Brush Settings

General

Note

More info at General brush settings and on Advanced brush settings.