Question: Document Block Output Suppression Problem

I am attempting to use document blocks to hide the Maple code for an interactive document and I'm encountering an unbelievably frustrating issue: if I create a new document block and suppress the output of the function calls therein with a colon, when I collapse the document block, the function calls are not hidden at all, but are displayed in a continuous line. If I do not supress the output, once I collapse the block, only the output is visible (which may be desirable except that I am doing things like loading packages, storing plot3d and plot variables, etc., and I DO NOT WANT THE OUTPUT VISIBLE). I am sure I'm making some painfully obvious mistake, but I just can't see it, and this is absolutely making me crazy; any suggestions would be DEEPLY APPRECIATED! Thanks a lot.
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