Thanks for your valuable feedback. We have recorded it as bug in our database.
Best Regards!Greg commented
Hello. I have the same problem with Adobe Reader DC (2018.01120040). To address it, I selected "No Scale" for the Scale for Screen Resolution option under Edit/Preferences. It shrunk the dialog box, but also shrunk the text and icons to a very small size. Consequently, I changed the Scale for Screen Resolution option back to "Auto Detect". Any suggestions? Thanks!