Geany 1.31, Windows 10

I'm learning python, set a folder on desktop and saved Geany file as hello_world.py. Then I tried to execute [print ("hello world")], didn't work.

So I tried to edit "set build commands", and found I can NOT type in anything into the Command boxes next to Labels, nor paste anything. I can only delete the default commands. I cannot type into the working directory boxes either.

I tried reinstalling Geany for 3 times, same issue. Is this a bug or I'm not doing it right?

thanks.