Sammy, I'm not sure if this answers your question, but I recolored by copying the block from the library, placing it in the sketchbook. Press the edit key once its in the sketchbook and you'll get the pop up window with color options. I'm not sure about a zoom, but it will enlarge the single block for you.
Be sure to make a paper copy of your quilt when you've designed it, just in case.
Best Wishes,
RETRO