How do i change all the existing Dimensions Font & Size?

there seems to be no way to change the text size or font for all existing Dimensions (without changing individually)

i was going to include a screen shot, but appears that is not possible. i think i observed that earlier. a picture IS worth a thousand words, you know?

so an example. i want to edit a dimension and set to an exact length, as opposed to trying desperately to drag the mouse to that exact length - usually with absolutely NO success!!

a right click on the dimension brings up lots of options: everything BUT simple Edit or Set!!!!

(and btw, pressing Enter does nothing)

so i waste HOURS and HOURS trying to get all my individual dimensions to the exact length i want. usually with no success.