Can't produce metric dimensions with the Dimension Tool

SketchUp
#1

Running Mac OS on MacBook Pro and new to SketchUp. The default seems to be Imperial and I can’t find the options to change this.
Thanks

#2

Window>Model Info>Units

#3

Life saver. Thank you Dave.

#4

You’re welcome.

FWIW, there are templates already setup with metric units. You just need to choose the right one. Or you can make your own template after changing the units to suit.