I'm using the latest version of Chrome on my desktop PC on W10 v1909 at resolution 2560x1440.

This displays fine in normal Chrome browsing. However, when I left click a displayed pdf file to save it, the Explorer window displayed is fuzzy. The normal Windows 10 Explorer window is fine.

I fixed the issue by using the compatibility option shown below:
Attachment 266224

Any idea what causes this and why it started hapening?