pdf on a website

@juliak10644825 for those viewing your PDF on their devices, this is is normal for a user who has a free version of Adobe Acrobat Reader, as Adobe uses these pop-ups to prompt users to upgrade to a paid version to access premium features like editing or combining PDFs. The side panel with individual page thumbnails is a standard feature in Acrobat's viewing interface. 

If you are looking at the PDFs on your paid subscription and and you are still seeing these pop-ups, it could be a sign that the application is not recognizing your active subscription. In this case, you should try logging out and logging back into your Adobe account within the Acrobat application.