What's preventing me from resizing (downsizing) my windows form object?

Autosize (which was set on the main Form object) was preventing the window from decreasing to a size smaller than the objects contained within it. As the objects within the main Form increased on each expansive resize, the main Form was unable to shrink after any resize growth. By disabling Autosize on the main Form object, I was able to regain full control of resizing.

If the above does not solve it, check that the form minimum size is not set to a value larger than you need.