You will need to change the percentage values ONLY in the Stretch section and keep them equal, meaning if you change the 1st value to 33 then the 2nd value has to be 33 too, to keep it proportional.Then all you need to do is save it.You may have to do this more than once to get the correct size you need, but once you figure the correct values then it should be the same for all the rest.Here is a p