setup() from turtle module not working

[bobfat]

Hello,

I am trying to make changes in the turtle graphics window size. I tried using the screensize() and the setup() methods, but no success. The latest code was very simple:

from turtle import *
setup(600,500)
for i in range(7):
    forward(50)
    left(90)
    forward(50)
    right(90)

I have updated my Python version to 3.8 and running under Windows 8.1 pro. I tried everything.... It doesn't work. Thank you for your help.