Hello, I'm Louie, and I'm happy to help you today. Hope you're doing well and safe there. I understand you'd like to remove users attached to your account.
Go to Settings > Accounts > Family & other users
Select the account you want to delete and click on Remove button
It will open a confirmation window and display a warning message, along with “Delete account & data” or Cancel button.
Click on the Delete account and data button to remove the user.
The warning is about the deletion of data of the user. When you remove an account, it will delete all the user data, including items like Desktop, Documents, Photos, Music, and other folders. If you haven’t backed up, there will be no way to recover those files.
You may also try the steps below.
Open Settings.
Click on Accounts.
Click on Email & accounts.
Select the account that you're planning to remove.
Click the Manage button.
Click the Delete account from this device option.
Click the Delete button.
Click the Done button.
Once you complete the steps, the account information will only be removed for the Mail, Calendar, and People experiences. If you want to remove a Microsoft account information completely, you also need to delete the information from the "Accounts used by other apps" section with the steps below.
Open Settings.
Click on Accounts.
Click on Email & accounts.
Under the "Accounts used by other apps" section, select the account that you're planning to remove.
Click the Remove button.
Click the Yes button.
After completing the steps, the account information will no longer be available on Windows 10.
Hope this helps.
Kind regards,
Louie