Altium Keyboard Shortcuts

Ctrl + Shift + Mouse Wheel

Scroll through layers

T + G + A

Repour all polygons

Shift + S

Switch between single layer viewing and all layer viewing

G + G

set snap grid

P + L

draw a line

R + M

measure distance

Shift + C

clear measurements (and some other things)

E + M + O

Rotate a selected component to a specified degree