From the 'User Maintenance Page', use the search bar above the grid containing the users to find the user to delete.
Select the user's record from the grid.
Click on Delete which is located below the grid containing the users.
When asked to confirm the deletion of the user, click on Yes to delete the user or No to leave the user as is.
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Good to Know:
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There is a system setting to toggle whether a confirmation is displayed when deleting a user. The setting is called 'Show Confirm On Grid Delete/Remove' and is found under the General Tab in System Settings.