The GEO Fail Over check box is available in the Modify FQDN screen. To access this screen, in the LoadMaster Web User Interface (WUI), go to Global Balancing > Manage FQDNs and click Modify on the relevant FQDN.
The Fail Over option is only available when the Selection Criteria is set to Location Based. When the Fail Over option is enabled, if a request comes from a specific region and the target is down, the connection will fail over and be answered with the next level in the hierarchy. If this is not available, the connection will be answered by the nearest (by proximity) target. If this is not possible, the target with the lowest requests will be picked. The Fail Over setting affects all targets.