Background color is disappeared

Hello Thin,

We're sorry for the trouble you had with the PDF, please reboot the machine once and check with the PDF and see if this brings any difference.

Navigate to Acrobat's Preferences once from Edit>Preferences>Accessibility and check if the checkbox 'Replace Document colors' is On or Off.

This and changing the background color by going to Tools > Pages > Background are the only two places that this can be changed within Acrobat.

Also, navigate to Edit>Preferences>Page Display>Select 'Show large images' under Page Content and Information section>Click OK and launch Acrobat again.

Is it specific to one PDF file or is it with all the PDF files? What is the version of Acrobat installed? To identify, refer to Identify the product and its version for Acrobat and Reader DC

Is it a Mac or Windows machine and what is the version of OS installed?

Check for any pending updates of Acrobat from help>check for updates, reboot the machine after updating Acrobat.

If it is specific to one PDF, Is it possible to share the PDF file with us so that we can test it at our end? To share the file, please use Adobe Send feature, login to https://cloud.acrobat.com/send using your Adobe ID(email) and password, upload the file, share the link to files via private message only, How Do I Send Private Message

Let us know how it goes and share your observation.

Thanks,

Anand Sri.