Inthe first subsection, the text “Opens with:” indicates which PDF viewer is set as your default. Click the Change button. Select Adobe Acrobat DC or Reader from the list as your default. Click OK to save and apply changes. Change from Preview to the Acrobat PDF viewer: Right-click on the thumbnail of any PDF file. On the menu, click Get Info.
ANUPDATE. Given the total lack of response, this is apparently a problem that nobody else sees, so I have uninstalled Acrobat DC using the standard procedure outlined here: uninstall-reinstall-acrobat.html. I then restarted the computer and reinstalled Acrobat DC from the Creative Cloud Desktop app.
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