When you have Google set as your default search engine in Google Chrome, you can open a New Tab page in Google Chrome and click/tap on the Customize button at the bottom to see the New Tab page customization menu.
Starting with Google Chrome 77, you can enable the Color and Theme menu to show in the New Tab page customization menu.
The Color and Theme menu allows you to change the Google Chrome browser color scheme using a color you select. You can select from a number of preset colors, the default color, or a custom color.
This tutorial will show you how to enable or disable showing the Color and Theme menu in the New Tab page customization menu in Google Chrome.