Windows 10: How to change image in Startup screen?

Hello guys, I've seen that other people has a different background image for startup screen. I mean the screen with your name. I have no idea how to change image there.I've automatic login and I don't need to insert name and password every time.
This screen.

:)

 

How to change the name on WELCOME startup in Windows 10

How do I change my last name upon startup of my computer? The name that appears is my married name and I have since become divorced and taken back my maiden name and, quite frankly, I hate seeing that name there. Please help?????

 

How to change the name on WELCOME startup in Windows 10

I may have corrected the problems I was having with an in correct welcome name, by checking out this help page. Will check by signing in again. I'll come back for more help if I haven't. Thanks, so far...

 

Lock Screen Background - Change in Windows 10

 

Well, I realized Windows Spotlight doesn't work for me. I found other threads about this problem, but nothing works for me.

 

[FIX] Windows Spotlight Not Working In Windows 10 - YouTube

 

Thanks. Still doesn't work.

 

https://www.microsoft.com/en-us/stor...t/9nblggh5km22

Fix Windows Spotlight is missing or doesn’t work | Scottie's Tech.Info

 

Nothing *Sad
The problem for me seems to be a little different. If I press Win + L to lock screen, picture changes.The problem is in startup login screen. It keep shows same image, even if I ticked "how lock screen background picture on the sign-in screen".

EDIT: Well, this look so bugged and random. If I choose "image" instead of Spotlight, and choose a random picture, it sometimes changes logon image as well, sometimes NOT.