Method 1: Disable Microsoft Edge InPrivate Browsing via Group Policy

1. Press the Windows key + R together, type gpedit.msc in the Run box and press Enter.

   

2. When the Local Group Policy Editor opens up, browse to the following path:
   Computer Configuration > Administrative Templates > Windows Components > Microsoft Edge

   

   On the right side, double-click the Allow InPrivate browsing policy.

3. To turn off inPrivate browsing, select Disabled, click Apply and then OK.

   

4. Now, open your Edge browser. Click on the More actions button (three dots). When the drop-down menu appears, the option labeled New InPrivate window will appear grayed out.

Method 2: Disable Microsoft Edge InPrivate Browsing via Registry Editor

If you’re using Windows 10 Home, the Local Group Policy Editor is inaccessible, but you can still disable Microsoft Edge InPrivate Browsing using the Registry Editor.

1. Open the Registry Editor and navigate to the following location:
   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft
2. Right-click on Microsoft key in the left pane and choose New -> Key, and name it MicrosoftEdge. Now right-click on the newly created key MicrosoftEdge and choose New –> Key, and name it Main.
3. Select the Main key in the left, and then right-click empty space in the right pane. Select New -> DWORD (32-bit Value), name it AllowInPrivate and set its value to 0.

   

4. Reboot your computer for the changes to take effect. Open Microsoft Edge. The New InPrivate window option should be greyed out.

If you want to turn on Microsoft Edge InPrivate browsing again, just following the same instructions above. But, change the value of AllowInPrivate from 0 to 1.