This option is not available when in the [Display Unit] link's [Extended Settings] tab, [Ethernet Multilink Settings] group's [Action Mode] property is set to the [Slave] option.
Enable
Sets up the GP-Viewer EX feature.
Enable Screen Changes from Client
Defines whether or not you can change the display screen from the GP-Viewer EX client.
If this item is not selected, even users with read/write privilege (as defined in the security settings) cannot change the screen from GP-Viewer EX.