Click on the Device and Document Settings tab. Click on Custom Properties in the list and then on the Custom Properties button. Enable or disable “Show results in viewer.” Click OK on the windows.
Read moreWhy PDF is not opening in my Android phone?
To fix a PDF file not opening in Adobe reader, you will need to download the latest version of Adobe Reader . After which you will disable the protected mode that comes with it by default. Once this is changed, the issue of the PDF file not opening in Adobe reader will be resolved.
Read more