Hello @Jellyfish_Grave,
Another way:
void setup()
{
println(displayWidth, displayHeight); //print before fullscreen()
fullScreen();
background(255);
println(displayWidth, displayHeight); //print after fullscreen()
}
void draw()
{
fill(0);
translate(displayWidth/2, displayHeight/2);
rectMode(CENTER);
rect(0, 0, 1000, 1000);
}
I encourage you to peruse the tutorials, references and examples here:
:)