How do you change the scale of the drawing? I usually work in 1/2" = 1' but cannot find how to change the scale.
That's a Document property.
If you normally have the rulers displayed, then double-clicking on a Ruler is a quick way to get there.
Can I ask why you work in scale?
Yes unless you're doing maps then it pays to work at 1:1.
100" wide signs don't fit on 11"x 17" paper at full scale.
Bobcycle just scale them down when you export for print, I do 100' + signs at 1:1