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Your output will go to the serial monitor window; not the IDE window you show.
Go to tools -> Serial Monitor which will open a monitor window, and select the correct baud rate.
This is all the same as for any other Arduino board.
You're doing your println in a setup() function - it just runs too fast and when you open up the Monitor it's already gone.
Either move your println statement to the loop() function or insert delay(10000) into the setup() function to give you some time to open the Monitor.winsketch output
EDIT: And yes, @rmm200 is absolutely right too - part of the window where you see that "Transfer complete" is just for IDE system messages, Serial output goes to the Serial Monitor