Windows 10: unable to restore main original administrator on my PC

i was borrowing my friends surface pro 8 and i logged into the computer using my microsoft account. i only borrowed it for one day then returned it to her and now for some reason her computer recognizes me as the administrator and now my onedrive and everything is showing up on her computer. it won’t let us put the original account that she had on the computer or let me sign out. like i said its acting as if i’m the main administrator of the computer. her old files from the original account are still on the computer but a bunch of my stuff from my onedrive is now on it as well. how do i sign m

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Restore original colours on PC

Hi Carolina,

Misconfiguration within your Windows settings and outdated graphics driver could cause the issue your display. For us to provide an accurate solution, we would need you to answer the following questions:

• Which build, version and edition of Windows is installed on your computer?
• What is the make and model of your device?
• Did you modify your PC display settings using the Settings app or did you use the buttons on your monitor?

For initial troubleshooting, we suggest following the steps provided in this
link.

We'll be waiting for your response.

 

Unable to restore or resize windows now

Hi,

I realize that you are unable to restore or resize windows. I will try to help you with this issue.

Please answer these questions to get more clarity on this issue:

• 
  Did you make any changes to the PC prior to this issue?
  
• 
  Does this issue occur on a different user account?
  

Suggest you to boot the PC in a clean boot state to check if that helps. A clean boot step will help us determine if any 3rd party service or application is causing this issue.

How to troubleshoot a problem by performing a clean boot in Windows:
How to perform a clean boot in Windows - Microsoft Support

Note: After you have finished troubleshooting, follow the steps under “How to reset the computer to start as usual after troubleshooting with clean boot” in the article to boot to normal startup.

Keep us informed to help you further.

 

Is it advisable/useful to have a second (full) Administrator account?

Firstly, I should say that someone suggested this Forum to me and it's one of the most useful things that I have come across on the Internet!
I read somewhere that one way to safeguard your system is to create a second Administrator account in addition to the one that is built-in in Windows, so that should there be a problem with the "original" Administrator account you would use the second one to restore the first one.
If this is indeed advisable, what are the steps to do it? I presume that I should password-protect the second Administrator account.
Would I have the second Administrator account always enabled and the original Administrator account always disabled?