Default Object Size decimal setting

Can anyone advise how to set the default object size decimal place setting in the menu bar display please?

For example, I draw a rectangle that I want to be .3125" (to four decimal places) high but the object size dimension readout on the menu bar rounds the setting to show .313" (to three decimal places). 

I want to change the default to four decimal places in the object size dimension readout on the menu bar.

Thank you in advance for assistance.

Pete