Customization of Toolbar colors in High Contrast modes
Currently, users working in high contrast modes cannot customize toolbar colors. Please consider providing the users with greater flexibility by allowing them to change the toolbar colors in high contrast modes. This feature allows users to enhance their UI experience and productivity.
Thanks for sharing this feedback with us Murthy. We will be passing this on to the engineering team. In the meantime under Settings > Personalization > Color, you can set an accent color of your choice and then select Title bars and window borders. That accent color will then be displayed on title bars.