You could create an "Area", put the calculations you want to hide in the "Area", then "Collapse" the "Area", and if desired, "Lock" it with a password, so that the hidden calculations can not be viewed without a password.
You can display the result of the hidden calculations outside the "Locked Area", so the result can still be seen, but the working can not. Just use a syntax like this to assign a result in the hidden working:
Result := MyFunction (parameter1, parameter2, ...)
Then below the hidden area, use syntax like this to display the result:
Result =
and you should get the output displayed something like this:
Result = "OK"
but the function used to generate the result won't be displayed.
Search the Mathcad Help file for "Grouping and Protecting Information with Areas" for more information.
We use this method to hide calculations which contain a lot of sensitive Intellectual Property, but we only distribute the printed / PDF output, NOT the native Mathcad file, because I am never too sure how secure such password protection schemes are, but it should be good enough to hide the working from casual "prying eyes". (I know there are password crackers for Excel, and I suspect the same can be done with Mathcad passwords, if you know how.)
Another approach is to put all the calculations you want to keep hidden on the right side sheet of the formatted output, and select "Print single page width" on the "Page Setup" menu. This only affects the printed output, but again, if you are only distributing "hard copy", it will have the desired effect.
Hope this helps!