Link speed and duplex can be either auto-neg or explicity set.
To confirm how the link speed and duplex is set.
Choose the edit option next to that interface in the list
Select the Phy tab on the top of the screen
All the duplex and speed options will be listed here as well as the choice of auto-neg
Note that changing these options will bounce the connection so should be done at a low traffic / low disruption time. And of course will disconnect you if this interface is in your path to the SSG.