Black and white

Hi Jitendra5D55,

Hope you are doing well.

Thank you for posting your query here. Please help me with few details to understand your issue better.

1. Application Version?
2. Source and type of document?
3. If you open the document in any other application, is it colored? 

Maybe, you accidentally turned on the night mode.

1. Go to your device’s settings screen.

2. Tap Display > Night Mode.

3. Disable Night Mode.

4. Move the Effect Strength slider to adjust how much Night Mode changes your display.

For more help refer to: https://www.adobe.com/devnet-docs/acrobat/android/en/accessibility.html#night-mode

Let us know how it works at your end. If you have any further queries please feel free to reach out to us.

Regards

Ria