How does SMS become black mode 0PP0A5?

First, go to the phone desktop and click the "Settings" button. Click "Desktop and Lock Screen Magazine" in the list to enter. Continue to click the "Set Theme" menu option to enter. Click "Open Theme Store" below to find more free themes. After selecting your favorite dark theme style in the Theme list, click Apply to return to the desktop, and you can see the new theme style after application.

Of course, you can also directly use the pure black background as the theme, then the phone will be in dark mode.