Sharon:
I took a look at door D1 12 with the Vision 1 door panel, and did not see any parameter for changing the window height. The height appears to be a fixed distance from the top of the door. You may need to create a Custom Door Panel to get the result you want. For more more information with images, go to Help > ArchiCAD Help, when your browser opens click on the "Search" tab, and input "Custom Component" in the search box.
Also, you should add your ArchiCAD version to your signature, it is helpful particularly with library parts.
David