Just right click and select Clear All Results Views or Clicking on the Clear Results Views Icon in the result view may not help
Please follow the steps to clear the Port names from the Field
On STC panel, Test Configuration -> Settings -> L2L3 ResultOptions -> select "Delete all analyzer streams when clearing results".
Right Click and Clear All Results View) or Click on Clear Result View Icon or use the command sequencer (Clear All Traffic Results),
The "Rx port names" value will be cleared