Hi Robert,
Next to the DRO for each axis is it's 'Scale DRO'.
They are currently all set to 1.0000 - clicking on one highlights it, typing in 0.5 and pressing return then makes that axis 1/2 size, (0.25 = 1/4 size) etc.
Clicking on 'Toolpath' screen button and then 'Regen Toolpath' button will show the new dimensions in the 'Program Limits' box, change screen back to 'Program Run' screen and readjust scales as necessary.
You will be an expert before you know it
Tweakie.