Improve the preview quality
The Edit mode is perfectly fine. But in View mode everything is pixelated when the zoom factor is set above 100%. This is true for both word documents and PDFs.
I am using Word Online's own zoom function on a large DELL monitor with 1920 x 1080 resolution. The problem is very glaring. It seems in preview mode, the document is not re-rendered at different zoom factors, only a static bitmap image of it is enlarged.
I am not the only one experiencing this... see https://onedrive.uservoice.com/forums/262982-onedrive/suggestions/7031129-improve-the-quality-of-the-preview