When I put an image on a brand new video track and I go to Pan/Crop and select the Workspace > Zoom(%) and increase or decrease it--the image doesn't change in the Video Preview. No matter what I do I cannot increase or decrease the size of the image.
Do you have a Nvidia GPU?
What happens if you use Pan/Crop and close that Pan/Crop window direct after the change?
@Angela-Cooper I have a feeling you are in the wrong section of Pan/Crop. You need to be in the Position section, not the Workspace section, where you can adjust the size and position of the video or image that you see in the video preview window. See if this tutorial helps: 
Thank you. I still don't understand what you mean by being in the position section vs. workspace section--but I found out that while in Pan/Crop if I do the Zoom manually or with my mouse wheel--after I do that, if I right click on the image and select "Match Output Aspect" it finally shows the zoom on when I close out of Pan/Crop. Basically it finally does what I want and changes the size of the image on the video track
Are you talking about this?
That's the zoom level of the image in the Pan/Crop window which lets you resize it in that window so you can more easily resize/position/use that window and has nothing to do with the image on the timeline. To change that, you would change the numbers in the top section (or drag the marks around the image to resize it in the Pan/Crop window.)
Workspace affects the fx working window area only, not the main Preview.
@Angela-Cooper If your image doesn't have the same aspect ratio as your project, it is possible to zoom in by selecting Match Output Aspect Ratio followed by Match Source Aspect Ratio. Just keep going back and forth like that and the image zooms in.