When restrictions are applied to any PDF document then the user is not able to use certain functions or tools. Please suggest me a simple and reliable way to enable highlight text tool in PDF document.” Why Highlight Option is Disabled in PDF Document? I need to share the biology notes to my friends as soon as possible with highlighted points in PDF. I am not able to figure out why highlight option is disabled in PDF.
But unfortunately, I was not able to use Highlighter option in Adobe as it was greyed out. Now, I need to highlight the important lines in the notes and share the PDF with my friends too. “My Biology professor gave notes to me in PDF format.
