How to Disable Acrylic Blur on Login Screen on Windows 10

Starting with the Windows 10 May 2019 Update (version 1903), as part of the Fluent Design System gradual rollout, the Sign-in screen adds an acrylic effect that blurs the background, removing surrounding clutter and helping you to focus the attention in the login task.

While this is a welcome addition, it's not a feature for everyone. If you prefer the traditional experience with a clear background, you can disable the acrylic material effect from the Sign-in screen in at least three ways using the Settings app, Group Policy Editor, and the Registry.
In this Windows 10 guide, we walk you through the different methods to disable the Sign-in screen acrylic material effect available with the May 2019 Update.
Method 1: Disable the sign in screen blur using Settings
This is the easiest method out there to turn off the blur effect on the login screen background picture, but on the flip side it turns off the transparency effect on Start, taskbar, Settings and other areas. If you want to turn off the blur effect only on the login screen, refer to the directions in Method 2 or 3.
1. Navigate to Settings > Personalization > Colors page.
2. Turn off the Transparency effects option to disable the blur on the sign in screen. However, as said before, this will also disable the transparency effects on the Start, taskbar, and other areas.

Method 2: Disable sign in screen blur using Group Policy
Please note that Group Policy Editor is not available in the Home edition of Windows 10.
1. Launch the group policy editor by pressing Windows key

+R, type gpedit.msc into the box, and press Enter.

2. Navigate to:
Computer configuration > Administrative templates > System > Logon
3. On the right side, look for Show clear logon background policy. Double-click on the same to open its properties.

4. Select the Enabled option and then click the Apply button to turn off the blur effect on the sign in screen background picture and show the clear picture.

Method 3: Turn off sign in screen blur using Registry
This method is compatible with all editions of Windows 10, including the Home.
Step 1: Open the Registry Editor by pressing Windows key

+R on your keyboard, type regedit into the box, and press Enter.

Step 2: In the Registry Editor window, navigate to the following folder:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows
Step 3: In the left pane, right-click on the Windows folder, click New, and then click Key. Name the new key System.

Step 4: Now, on the right side, right click on an empty spot, click New and then click DWORD (32-bit) Value and then name it as DisableAcrylicBackgroundOnLogon.

Step 5: Finally, double click on the newly created DisableAcrylicBackgroundOnLogon value and set the value data from the default 0 to 1 to turn off the login screen blur effect.