You might notice that the default units are millimeters (“mm”). If you look at the “Units” tab, you will see an option to pick “pixels”. But you won’t find an option for “inches”. Why is that?
The short answer is that millimeters are smaller than inches and I don’t have to use decimals as often.
It is not the best reason for not having inches. So, this will be fixed in the next major release. You will have an option to select inches, including the the ability to switch between inches and millimeters.