You can remove identities from system roles.
To remove an identity from a system role
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In the menu bar, click Responsibilities > Governance Administration.
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On the Governance Administration page, click System Roles.
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On the System Roles page, click the system role you want to remove an identity from.
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In the details pane, click Edit.
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On the overview page, click Memberships.
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On the Memberships - <system role name> page, select the check box next to the system role that you want to remove.
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Click Delete memberships.
This cancels the system role's assignment.
(Expand) next to Analysis for.