Default username in UAC prompt

[Microsoft Windows]

I have three PCs, two running Windows 11 Home and one Windows 11 Pro. On the Pro one and one of the Home ones, when a process requires administrator rights and I am logged in as a standard user, I get the UAC prompt with the username already filled in, while on the third it is blank: can anyone explain this, please, and let me know how to change things so that the username is always filled in. The only difference I have been able to find between the machines is that, on the ones where the username is filled in, an administrator account has the numerically lowest SID (apart from the "built in"

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