The Annotate Library should open between your document and the Word toolbar, to a predetermined height that makes several rows of content, and the important buttons, easily visible.

This is how the Annotate Library should appear. Notice that the Help + Instructions and Save and Update Menus buttons are clearly displayed.

For any number of reasons (although the chances are small), you Library might appear in a different location. You might have moved it unintentionally, or Microsoft Word might have had a senior moment. In any event, repositioning the Library is quite easy, and it's a good feature to know about. Here is an example of an incorrectly positioned Library:

To reposition the Library, click on the light blue title bar where you can see Annotate PRO Comment Library. Click and hold (your mouse arrow will turn into a little cross), and drag. Notice that you can drop the Library on top, on bottom, on a side, or even leave it disconnected from the Microsoft Word window (for those with multiple monitors). Here is an image of the Library being moved: