Now right-click on the "CredUI" key you just created, select "New" , then "DWORD" as shown in the picture, named "DisablePasswordReveal".
Then double-click the newly created key, enter the value as "1" , click "OK" and close the Registry Editor then restart the computer.
If you are using Windows 8 / 8.1 Pro version, you can disable the password display button by using Local Group Policy Editor. To start, press the Windows + R key combination to open the Run dialog box, enter " gpedit.msc" and select "OK" or enter "gpedit.msc" in the "Search" frame of the Charm Bar.
When the Local Group Policy Editor interface appears, you access the following link:
Select "Do not display the password reveal button".
Double-click "Do not display the password reveal button" , select "Enabled" . Then select "Apply" , "OK" then close the Local Group Policy Editor and restart the computer.
And this is the result after you use either method. The password display button is no longer available.