The first and most convenient method to change administrator on Windows 11 is to use the Settings app. You can open Windows Settings app and tweak some settings to switch the administrator account.
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Use This Setting to Easily Control Windows User Permissions

Windows displays a User Account Control (UAC) prompt whenever you attempt to install or run an existing application as an administrator. If you want additional control over your account's permissions, ...
User Account Control (UAC) helps prevent unauthorized changes. We don't recommend switching it off. Using the Control Panel leaves little room for error vs. editing ...