I reset the default PDF viewer to Acrobat Reader DC and it stays that way, until I upload another PDF using Chrome. To change the default PDF viewer, first, you need to identify the app that has hijacked your PDF files. But the recipient received the email displaying the pdf file in “view in place” format. The PDFs are not populated by default because Adobe implemented a new security feature to prevent certain PDF properties from displaying by default as they could contain malicious content.
To choose how to display documents, click PDF or Images, then choose an option next to “Define 100% scale as.” By Scott Nguyen, Integrated Sales and Support. Click on “.PDF” entry, and then click the “Change program” button. System Theme - When you choose System Theme, Acrobat changes the UI as per the OS theme.If the OS theme is changed while Acrobat is running, then Acrobat’s theme also gets updated.