White box overlay on PDF while connecting or disconnecting from laptop dock | Acrobat

Whenever you connect or disconnect your laptop from the dock and it changes the display resolution, Acrobat displays a large white area on any open PDF.

Resolution

To turn off the PDF/A viewing mode, do the following steps:

1. Go to Acrobat>Edit>Preferences.
2. Under Categories, in the Preferences dialog box, select Documents.
3. Choose the Never option for View Documents In PDF/A Mode.
4. You can switch in or out of PDF/A viewing mode by changing this preference setting.