When you use Dark mode, all your device's menus, settings, and preloaded Samsung apps will use a darker theme. Some third-party apps will stay the same, however.

1. First, swipe down from the top of the screen with two fingers to open the Quick settings panel.
   
   Note: You can also access Dark mode on devices running Android 10 and later by opening Settings and then tapping Display.
2. Tap the Dark mode icon. The icon will glow when the mode is enabled.
   
   
3. To turn the mode off, tap the icon again.

If you forget to enable Dark mode, just make it automatically turn on or off at a set time. Even if you set a scheduled time for Dark mode, you can still manually turn it on or off whenever you want.

1. First, swipe down from the top of the screen with two fingers to open the Quick settings panel. Then, touch and hold the Dark mode icon to open its settings page.
2. Tap the switch next to Turn on as scheduled.
   
   
3. Tap Sunset to sunrise to make Dark mode automatically turn on in the evening and turn off in the morning.
4. Or, tap Custom schedule instead to set your own schedule for Dark mode. Tap Set schedule, and then select your desired Start and End times. Tap Done.

Eye comfort shield is available on One UI 3.1 and higher devices. You can turn this on to limit your screen’s blue light. It's similar to the regular Blue light filter except a special algorithm will adjust your screen's color depending on the time of day.

Using two fingers, swipe down from the top of the screen to open the Quick settings panel, and then tap the Eye comfort shield icon. Your screen's color will have a slightly yellow tint that will change over time.

Touch and hold the Eye comfort shield icon to adjust its settings. You can select Adaptive to change the screen’s colors based on the time of day, or Custom to choose a schedule and color temperature that is right for you.

The options for Custom are below:

• Set schedule: Choose from Always on to keep Eye Comfort Shield enabled at all times, Sunset to sunrise, or Custom. With Custom, you can choose the exact time you’d like Eye Comfort Shield to turn on and off.
• Color temperature: Adjust the slider to change the screen’s color tone.
• Enhanced comfort: Adds additional adjustments to the color and contrast of the display for more comfortable viewing.

Extra dim will dim the screen for a comfortable viewing experience. It’s available in the Quick settings panel. However, if the icon doesn’t appear, you can add it.

1. First, swipe down from the top of the screen with two fingers to open the Quick settings panel. Tap the Extra dim icon to turn it on. Your screen will dim slightly.
2. Touch and hold the Extra dim icon to open its settings.
   
   
3. From here, tap Extra dim shortcut, and then tap the switch at the top to turn on the shortcut. Then, select your desired actions for using the feature.
4. Tap Back, and then select your desired Intensity setting by adjusting the slider.
5. Finally, tap the switch next to Turn off after restart to disable Extra dim after restarting your device.