Open your phone, find and click the "Settings" icon.
Scroll down in the settings menu to find and tap the "Display & brightness" or "Display" option.
On the display settings page, find "Theme Mode" or "Night Mode," click it, and select "Dark" or "Dark Theme."
If the dark mode feature is not built into your Samsung s8 system, you will need to download a third-party app to implement dark mode. Here are some commonly used apps and how to use them:
Visit the Google Play Store, search for and download applications such as "dark mode switch" and "dark mode switcher".
Once the installation is complete, open the app and follow the in-app instructions to enable dark mode. Typically, you can quickly switch to dark mode with the click of a button.
Some apps allow users to customize the details of dark mode, such as color intensity, activation time, etc., which you can adjust according to your personal preferences.