Settings - USB Server/USB Client Properties
To open Properties window of USB server or USB client just double-click on the selected USB server or USB client or click Edit > USB Server... menu item.
After that you will see Properties window of the currently selected USB server or USB client.
This window shows information about current connection to USB server or USB client.
You can setup a server-wide auto-connection here by changing the "Auto-connect all USB devices when they become available!" checkbox.
Click OK or Apply to save your changes.