Why does my code only show part of the scene?

[rontgen]

I drew four points and wanted to draw a rectangle with the line tool, but when I ran the code, only part of it was displayed. I tried to modify the scale of camera, but it didn't work. I want to display all objects in the scene. Thanks for the reply
code:

class MyFirstScene(MovingCameraScene):
    def construct(self):
        #self.play(self.camera.frame.animate.scale(3))
        dotA = Dot([0, 0, 0])
        dotB = Dot([6, 0, 0])
        dotC = Dot([6, 5, 0])
        dotD = Dot([0, 5, 0])
        dotE = Dot([6, 6, 0])
        dotF = Dot([5, 5, 0])

        lineAB = Line(dotA.get_center(), dotB.get_center())
        lineBC = Line(dotB.get_center(), dotC.get_center())
        lineCD = Line(dotC.get_center(), dotD.get_center())
        lineDA = Line(dotD.get_center(), dotA.get_center())
        
        self.add(lineAB, lineBC, lineCD, lineDA)

The example code VectorArrow
https://docs.manim.community/en/stable/examples.html

from manim import *

class VectorArrow(Scene):
    def construct(self):
        dot = Dot(ORIGIN)
        arrow = Arrow(ORIGIN, [2, 2, 0], buff=0)
        numberplane = NumberPlane()
        origin_text = Text('(0, 0)').next_to(dot, DOWN)
        tip_text = Text('(2, 2)').next_to(arrow.get_end(), RIGHT)
        self.add(numberplane, dot, arrow, origin_text, tip_text)

I had the same problem

It should be