"Format" pull down menu,
"Dimension Style"
"Dimension" choices menu should be open, if not click on the "+" box to open it.
Click on the "+" box beside "Linear Dimension" to show the options. Down toward the bottom is "Scale Factor". I think that is the one you're asking about.

If you need to change an existing dimension, you can left click on the dimension to highlight it, then right click and it will pop out a menu box. At the bottom, you can pick "Properties" and the properties settings box will open on the left of your screen. It will display the properties of the selected object. If you have a dimension selected, scroll down to "Primary Unit System" heading. The fourth line down has "xn" with the n much larger than the x. The x is meant as a multiplication sign, i.e., "dimension times n". Hold the cursor over it and it will pop out the explanation, in this case "Dim Scale Linear". You can change one dimension and then use the Property Painter tool button to select that dimension and then copy its format to any others you need to. The button looks like a pencil. I think it is supposed to be a paintbrush, but instead of a wide house painting brush, they use a small round artist's type paintbrush for the icon.

Thanks so much. I have been using the property painter but it was still a pain in the neck. So changing within the drawing is so much more efficient. I stand to learn something new every day! Thanks again!