Method 1: Using Settings

1.   1. Open Settings: Click on the Start button and select the Settings gear icon. Alternatively, press Windows + I on your keyboard.
2.   2. Go to Personalization: In the Settings window, click on "Personalization" from the left-hand menu.
3.   3. Select Colors: Click "Colors" in the Personalization menu.
4.   4. Choose Dark Mode:
   •       Find the "Choose your mode" drop-down menu.
   •       Select "Dark" from the drop-down options.
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Method 2: Using the Quick Settings Panel

1.   1. Open the Quick Settings Panel: Click on the taskbar's network, volume, or battery icon to open the Quick Settings panel. Alternatively, press Windows + A.
2.   2. Edit Quick Settings: Click on the pencil icon to edit the Quick Settings.
3.   3. Add Dark Mode:
   •       If the "Dark Mode" toggle isn't already there, click on "Add" and then select "Dark Mode" to add it to the panel.
4.   4. Enable Dark Mode: Toggle the Dark Mode switch to enable it.
5. 
   

Method 3: Using Registry Editor (Advanced Users)

1.   1. Open Registry Editor: Press Windows + R, type regedit, and press Enter. Confirm any UAC prompts.
2.   2. Navigate to Personalization: Go to the following path: 
4.       HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize
5.   3. Modify System Uses Light Theme:
   
6. •       Find the SystemUsesLightTheme entry.
   •       Double-click it and change its value to 0.
7.   4. Modify Apps Use Light Theme:
   •       Find the AppsUseLightTheme entry.
   •       Double-click it and change its value to 0.
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Method 4: Using Command Prompt or PowerShell

1.   1. Open Command Prompt or PowerShell: Right-click the Start button and select "Windows Terminal (Admin)".
2.   2. Run Commands: 
3.       For System theme: reg add"
4. HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize" /v SystemUsesLightTheme /t REG_DWORD /d 0 /f

1. • 
     
   •       For Apps theme: reg add"
   • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Themes\Personalize" /v AppsUseLightTheme /t REG_DWORD /d 0 /f
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You can enable Dark Mode in Windows 11 by following any of these methods. The first method using Settings is the most user-friendly and recommended for most users.