I have done everything your web site, and others have told me. I have locked screen on a solid purple. I have bad eye sight, I cannot find my icons with the pictures it puts on.
In newer Windows 10 builds, Microsoft has added an option to disable/turn off background image of login screen in. every time I log in, it is back to a picture, so redo it again, and again. plus it moves my icons,. help
Settings app:

1. Press WIN+I keys together to open Settings app.
2. Now go to "Personalization -> Lock screen" section and set the option "Show Windows background picture on the sign-in screen" to Off.