Legacy UI

For one instance in cluster

Goto Configuration > Servers and Sites > Default Server Settings > Advanced and add:

XUI.enable=false

or change java system property:

-DXUI.enable=false

For all instances in cluster

Goto Configuration > Servers and Sites > Select server > Advanced and add:

XUI.enable=false

XUI Interface

For one instance in cluster

Goto Deployment > Servers > Choose server > Advanced and add:

XUI.enable=false

For all instances in cluster

Goto Configure > Server Defaults > Advanced and add:

XUI.enable=false