Only where the tools sit changes; every tool is in every layout.
Device
Pencil: click, draw and drag precisely. One finger orbits, two pan and zoom. Two-finger tap undoes, three-finger tap redoes, a long press opens the menu.
Performance
Every tool works the same in every mode; only how the view is drawn changes.
Sketch lines
How sketch lines look in Advanced, Beginner and Chisel. Thinner lines make small profiles easier to pick.