For Win10 Home to disable blur, create a file with notepad, should also work on Pro (not tested on Pro, keep forgetting to double check so end up using gpedit as posted above by fg, does work on Home, tested):
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System]
"DisableAcrylicBackgroundOnLogon"=dword:00000001
Rename to "whatever-you-want.reg" and click on the registry file or set manually with registry editor.
Reboot. That's all folks.
If for some reason you want to enable again, same process for a reg file or manually delete line with registry editor:
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\System]
"DisableAcrylicBackgroundOnLogon"=-
Regards,