Hi,
This PC\Windows(C:)\Users\user\LocalSettings is the same location as...
This PC\Windows(C:)\Users\user\AppData\Local...
Strange, I know... but true... The permission requirements are different...
If you go to Control Panel and set the "View" to small icons, you will see "User Accounts" as it was in Windows 7... This allows more options than the Windows 10 "Accounts"..
There is a button to change your account name... In my opinion, this is something that has some risk involved... You might want to make a backup image of your windows partition first...