Please have a look at the screen grab video.
As you can notice, the document colors are muddled (it should be bright red) but in the page preview (to the right) colors look exactly as they should - saturated.
Also, once I choose the Read Mode, colors are fine, well-saturated.
What's going on? Any help much appreciated.
Sorry for the delay in response.
As you have mentioned above, I have checked the video showing the change in the color.
Could you please let us know how the PDF is created?
What are the name and the dot version of the application installed on your system?
Did you try to replicate the issue with other PDFs?
If not, please try to check if this issue occurs with other PFDs as well.
It will be helpful if you can share the file with us, so we can replicate the issue at our end.
You may refer the steps provided here How to share a file using Adobe Document Cloud to share the file with us.
We will be waiting for your response.