Hi,
Thank you for posting your query in our community.
Based on your description, when you try to import PDF file in Excel, the Navigator window will not pop up. I tested it on my side, however, there was no problem.
To check whether the issue is related to the specific file, or the Excel application, could you please try to import from a simple PDF file to see if the problem happens again?
Additionally, could you please provide a screenshot of your Office Product Information(open an Office application>File>Account>capture a screenshot of the Product Information column)
Best regards,
Jazlyn