Help me please how to remove little circle?

Processing Coding Questions
20

Thats the code I used:

ArrayList<PVector> pts = new ArrayList<PVector>();
final float minDist = 10;

void setup() {
  size(640, 480);
  background(255);
  
  strokeWeight(10);
  stroke(255, 0, 0, 50);
  
  pts.add(new PVector(0, 0));
}

void draw() {
  int lastPt = pts.size() - 1;
  if (dist(pts.get(lastPt).x, pts.get(lastPt).y, mouseX, mouseY) > minDist) {
    pts.add(new PVector(mouseX, mouseY));
  }
  
  background(255);
  
  beginShape();
  for (int i = 0; i < pts.size(); i++) {
    vertex(pts.get(i).x, pts.get(i).y);
  }
  endShape();
}
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