Hide a User Account
The system doesn't display hidden users in selection lists and it is not possible to sign in to the system with a hidden user account.
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Go to System Tools > System Security > Users.
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Find the user you want to hide and select Open
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Alternatively, you can select the user ID to open the User Preferences wizard.
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On the User Options page of the User Preferences wizard, select the Change User's Preferences option.
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On the User Details page, select the Security tab.
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In the Account Status section of the Security tab, select the User account is hidden option.
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Select Finish to complete the wizard.