In Android 10, you can use Google to adjust the accent colors to add a touch of flair to your phone. In combination with the new system-wide dark mode, eight different color combinations are displayed. That's seven more than in the previous version and seven additional ways to highlight your phone.
This feature is very similar to the accent colors of Oxygen OS. You can set the secondary color (blue by default) in the places where it appears in Settings and Quick Settings. This differs from the system-wide dark mode, where the primary color changes from white to black. Instead, the color of the active quickset tiles, the toggle buttons, and more changes.
: Enable Developer Options
The first step is to enable Developer Options. To do this, open Settings and select "Over the phone". Search for "Build number" (the last option) and tap it seven times quickly until you're redirected to a new page that asks for your lock screen password, gesture, or PIN. Upon successful entry of the requested information, a toast message will appear with the message "You are now a developer" and you will be returned to the previous page.
Return to Settings and select System. Select "Advanced" and a new option will be displayed via "System Update" called "Developer Options". Choose this option.
When the developer options are open, scroll to the bottom of the page, until you see a grouping titled "Theming". Select the first option, "Accent Color," and a pop-up window will appear with four options: "Device Standard, Black, Green, and Purple." These are the accent colors you can switch to, with blue as the default.  How to Get New Themes for Your Pixel on Android 10 ” width=”532″ height=”532″ style=”max-width:532px;height:auto;”/>