So, when I get on Nr2003, it opens as the default full screen window. But, how do I change the window size on it? I've seen people on youtube do it but I can't figure it out.
Do you mean the resolution? If so, click on "config 3d graphics "or open the nr2003 folder and click on the 3d graphics logo. ether way when it opens select your resolution from the drop down box.