Multiple Accounts

Windows 11 supports multiple sign-in accounts. This can be useful in many situations. But the most obvious is for families, in which one or more parents or caretakers, and one or more children, can each have their own account, each with its own customized Windows 11 experience.
Understand account types
One issue with this configuration is that each account must be configured with an account type that determines which tasks they can complete. Windows 11 supports two account types:

Administrator. Sign-in accounts with Administrator privileges have complete control over the system, including other user accounts.

Standard user. Sign-in accounts with Standard privileges can only control their own accounts and may sometimes need to ask a user with Administrator privileges to authorize certain tasks that could result in changes to the system or another user account. This authorization occurs via a User Account Control (UAC) dialog in which the Standard user is prompted to provide an "admin" (Administrator) sign-in.

Those will families can exert additional control over their children and their sign-in accounts using Microsoft Family parental controls. This is configured via the Microsoft Family app, which is available in the Microsoft Store.
The initial sign-in account---usually the Microsoft account you used to complete Windows 11 Setup---is always configured with Administrator privileges. And subsequent sign-in accounts created in the Windows 11 Settings app are given Standard user privileges by default.
Add and manage sign-in accounts
Anyone with Administrator privileges can Add additional sign-in accounts. These can be Microsoft accounts, work or school accounts, or local account sign-in accounts.
Add and manage a Microsoft account or local account sign in
To add a new Microsoft account or local account sign in, open Settings and navigate to Accounts > Other users. Then, click the "Add account" button next to "Add other user" in the "Other users section." The Microsoft account window appears.

To add a Microsoft account sign in, enter the email address and authenticate against Microsoft's servers as prompted. To add a new local account, select the "I don't have this person's sign-in information" link and then select the "Add a user without a Microsoft account" link in the Create account window that appears. Then add a username and, optionally, a password, as prompted.
The latter process is described in more detail in Local Accounts.
Any user on the PC with Administrator privileges can change the account type of a Microsoft or local account with Standard user privileges to an Administrator. But be careful with this, as doing so will give them control over the PC, and this includes access to any documents and other files in your account.

To do so, locate the account you wish to change to an Administrator and select it to expand the view. Then, click the "Change account type" button. The Change account type window appe...