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Click File. Click Info. Click Properties . Click Advanced Properties. Click the Summary tab. Uncheck the box  for "Save Thumbnails for All Word Documents. Click OK.
It's the first option in the top-left of the blue menu bar at the top of Word. It's the first option at the top of the blue column on the left. It's at the top of the right side of the page. This opens a small drop-down menu with one option. It's the only option that appears next to the icon of a small bullet-point list. This will display the Properties window for your document. It's the second tab at the top of the window. "   It's at the bottom of the "Summary" page. If your document has a lot of images, disabling this feature will reduce the file size of your Word document even more. This will save the changes to your document.