Hi Miga4555,
Thanks so much for the screenshot. As the issue isn't visible on our end, let us know what happens if you start your Mac in safe mode. Does the color appear as expected at that point? Here's a guide with the steps to walk you through the process:
How to use safe mode on your Mac - Apple Support
If the issue does not occur in safe mode, but returns on the next normal restart, test your login items following these instructions:
Remove login items to resolve startup problems on your Mac - Apple Support
If it remains washed out in safe mode, the next step would be to start up in macOS Recovery, and browse the web online using Safari there. This guide explains how to start in macOS Recovery and open a Safari session there:
Use macOS Recovery on an Intel-based Mac - Apple Support
If the colors are washed out here, this helps to isolate the issue to the display itself. At that point, you'll want to reach out to Apple Support to determine options to have your MacBook Pro examined in person.
Here's a direct link to continue with Apple Support:
Get Support
Take care!