so i misunderstood your problem slightly (i just skimmed and thought you were saying that everything was displayed at the wrong size and so objects and words were all jumbled up). a little trickier. those other options would work here, but a better solution (at least until you move to a different version of pd) is to open the patch in a text editor and change the dimensions yourself. then the help patch will always open at the right size. you will need to ctrl-click on the pd package, and display the contents. go to resources, and then doc. here are all of the help patches. open the one you want, and look at the first line. here is A01.sinewave.pd's first line:
#N canvas 6 2 588 513 10;
the '588 513' is the dimensions, in pixels. width and height. you will have to change the permissions for the file and the directory in order to save the changes. kind of stupid and harder than it should be.