Mixed fractional notation

It took me a while but I found the setup for fractional notation. When I try to input
a dimensional change the input box is always in mm. I have the dimension format set to inches.
How do I setup the program to input and display just fractions ie 25 5/16.

Example: I draw a rectangle then I use smart dimension. The length is shown as a fraction.
When I click the dimension to change the length of the line the input box is always in mm.

Re: Mixed fractional notation

It seems by reinstalling the program and setting the default to ANSI during the install. And also setting up a new dimension format from within the applcation solved the issue.