How to disable the "Acrylic" defocus of Fluent Design from the login screen in the Windows update May 10, 2019
To disable Fluent Design in the Windows 10 login screen:
- ] Starts the Registry Editor.
- Go to HKEY_LOCAL_MACHINE SOFTWARE Policies Microsoft Windows registry key.
- Right click on System in the tree view on the left.
- Click on New> DWORD (32-bit value) and name the value "DisableAcrylicBackgroundOnLogon".
- Double click on the new value and change its value to "1".
Applies to Windows 10 1903
With the Windows update May 10, 2019, Microsoft made a simple but very noticeable change in the login screen. Now it presents the translucent "Acrylic" blur effect of Fluent Design, which makes the background image almost unrecognizable in an attempt to focus on the login form.
If you prefer to keep your background photo visible, without the additional blur, there are a couple of ways to disable the new effect. Both will restore your login screen with the same style used by Windows 10 October 2018. updated and earlier.
The fastest way to do this is to turn off transparency in total. Start the Configuration application and click on the "Personalization" category, followed by the "Colors" page in the menu on the left. Turn the toggle button "Transparency Effects" to the off position.
This method disables transparency completely, which may not be what you want. If you want to keep the transparency of Fluent Design but remove the blur from the login screen, you must manually edit a registration key. Our usual warning applies: be careful when editing the registry, since errors can lead to a system that does not work.
Find and start the registry editor from the Start menu. Paste the following key in the address bar at the top of the screen and press enter:
HKEY_LOCAL_MACHINE SOFTWARE Policies Microsoft Windows
On the left sidebar, right-click on the key "System" in the expanded node. In the context menu, choose New> DWORD (32-bit value). According to HowToGeek, you must name this value as "DisableAcrylicBackgroundOnLogon". Next, double click on the value to open the value editor and change the data field to "1".
It is ready. Try pressing Win + L to lock your PC and display the login screen. You should find that the Acrylic effect has disappeared, so you have Fluent Design again with a standard login screen: how it was before the May 2019 update.
Additional reading: Fluent Design, Windows 10, Windows 10 Update May 2019