Configuration panel lets you set advanced access rights for the selected shared serial port and specify serial port connection parameters:

Add application with custom access rights option lets you select application which you may set custom access right for. Click folder icon
at the end of the text field to invoke "Open file" dialog and navigate to desired execution file.
"Allow reading", "Allow writing" and "Manage control lines" checkboxes let you turn reading, writing and control lines management on/off respectively.
Unset custom rights button removes all custom rights for selected shared serial port
Set custom rights button assigns new custom rights to application for shared serial port, selected in Serial ports tree. Important notice: if the same application (which has "Manage control lines" option enabled) connects to shared serial port, only the first application will be able to manage control lines. Additionally, you must re-open serial port to apply changes.
Serial port connection parameters can be set by selecting from "Use dynamic parameters" and "Use custom parameters" radio-button options. If you select "Use dynamic parameters" option, shared serial port will be opened with connection parameters (baudrate, databits, stop bits, parity, flow control) set by the application that connects to this port. Moreover, this application must have "Manage control lines" access rights option enabled. On the other hand, you may specify connection parameters directly in Shared Serial Port if you select "Use custom parameters" option. Finally click "Apply" button to apply changes.