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....
To use the Drawing tools, hit ViewToolbars and choose Drawing, or just hit the icon on your Standard toolbar. Sometimes, the only way to select a graphic is by using the Selector Tool on the Drawing Toolbar. Here's the Drawing toolbar, in case you're not familiar with it.