The description of these behaviors is termed the mechanism. When scientists are not provided with such a mechanism, then a description of a process, it's explanation, or it's understanding, is questioned. Astrology does not work with mechanisms. It works with relationships, patterns, tendencies, and interpretations. It does not always give a yes or no answer.
I hate the Drawing Canvas and I understand that it's not backward compatible, so I never use it. To turn it off in Word 2002 and above, go to Tools 4 Options, General tab. Untick Automatically create drawing canvas....
1 Click the Insert menu and Click Text Box in the Text group. Then, choose Draw Text Box (from the list below the gallery options). In Word 2003, choose Text Box from the Drawing toolbar (View, Toolbars, Drawing).  Use the mouse to drag and drop a text box of the approximate size in the margin.