Steps
1. Open Acrobat or Acrobat Reader. On the Edit menu, choose Preferences.
2. In the Preferences dialog box, choose General in the Categories list, and
then select the Enable PDF thumbnail previews in Windows Explorer check box.
Enable PDF thumbnail previews
Note:
If you don't see the Enable PDF thumbnail previews in Windows Explorer checkbox,update your
Acrobat DC or Acrobat Reader DC to the latest version. To automatically update from the product,
choose Help, Check for updates and then follow the steps in the Updater window to download and
install the latest updates.
3. Click OK.
Wait for a few seconds while Acrobat is configured to show thumbnail previews in Windows Explorer.
I hope this helps.
