Settings - Callback Connection Properties
To open Callback Connection Properties window, double-click on the selected callback connection item or select Edit > USB Server... menu item.
This window shows the information about selected callback connection.
You can change the settings of USB device auto-connection on the remote USB client by clicking "Automatically connect USB devices when they become available" checkbox.
Click OK or Apply to save your changes.
If you want to allow the remote user to manage this callback connection (change automatic connection settings or even remove this connection), you should enable "Allow remote client to control this connection" checkbox. Otherwise, the remote user will not be able to manage this connection without your permission.