There are several ways to open Encoder Settings window after adding an encoder , these are;
From right click on the Preview Window ,
From right click on the Encoder at the Left Panel which shows Encoder entities ,
From the Encoder Menu ,
After clicking "Settings" selection , "Encoder Settings" window appears. There are two selection tabs at this window:Streaming, Snapshot and Preview.
Display TC on encoder Preview = Enable - Disable (If this option is enabled, It shows the timecode on the encoder screen)