Python Kivyで表示される画面が小さい

###前提・実現したいこと
Kivyを使ってボタンを画面全体に表示させたいです。ただそれだけなのですが、、、

発生している問題

表示が全面になってくれません。
想定では画面全体にボタンが表示されるはずなのですが左下にだけしか表示されません。ボタンの外側の黒い部分をクリックするとボタンが押されたアクションをするため、見た目だけの問題のようです。
何が原因なのでしょうか？
分かる方がいらっしゃいましたらご教示下さい。よろしくお願いいたしますmm

該当のソースコード

Pythonのソースコード

from kivy.app import App
from kivy.uix.button import Button

class TestApp(App):
    def build(self):
        return Button(text='Hello World')

TestApp().run()

Pythonファイルを実行した際のターミナルの表示

[INFO   ] [Logger      ] Record log in /Users/[UsersName]/.kivy/logs/kivy_20-03-07_1.txt
[INFO   ] [Kivy        ] v2.0.0rc1, git-9398c8d, 20200305
[INFO   ] [Kivy        ] Installed at "/Users/[UsersName]/.pyenv/versions/3.7.5/lib/python3.7/site-packages/kivy/__init__.py"
[INFO   ] [Python      ] v3.7.5 (default, Mar  5 2020, 22:24:43) 
[Clang 11.0.0 (clang-1100.0.33.17)]
[INFO   ] [Python      ] Interpreter at "/Users/[UsersName]/.pyenv/versions/3.7.5/bin/python"
[INFO   ] [Factory     ] 184 symbols loaded
pygame 1.9.6
Hello from the pygame community. https://www.pygame.org/contribute.html
[INFO   ] [Image       ] Providers: img_tex, img_imageio, img_dds, img_pygame, img_pil (img_ffpyplayer, img_gif ignored)
[INFO   ] [Text        ] Provider: pygame
[INFO   ] [Window      ] Provider: pygame
[WARNING] [Deprecated  ] Pygame has been deprecated and will be removed after 1.11.0: Call to deprecated function __init__ in /Users/[UsersName]/.pyenv/versions/3.7.5/lib/python3.7/site-packages/kivy/core/window/window_pygame.py line 42.Called from /Users/[UsersName]/.pyenv/versions/3.7.5/lib/python3.7/site-packages/kivy/core/__init__.py line 70 by core_select_lib().
[INFO   ] [GL          ] Using the "OpenGL ES 2" graphics system
[INFO   ] [GL          ] Backend used <gl>
[INFO   ] [GL          ] OpenGL version <b'2.1 INTEL-14.4.23'>
[INFO   ] [GL          ] OpenGL vendor <b'Intel Inc.'>
[INFO   ] [GL          ] OpenGL renderer <b'Intel(R) Iris(TM) Graphics 6100'>
[INFO   ] [GL          ] OpenGL parsed version: 2, 1
[INFO   ] [GL          ] Shading version <b'1.20'>
[INFO   ] [GL          ] Texture max size <16384>
[INFO   ] [GL          ] Texture max units <16>
[INFO   ] [Window      ] virtual keyboard not allowed, single mode, not docked
[WARNING] [Deprecated  ] Pygame has been deprecated and will be removed after 1.11.0: Call to deprecated function __init__ in /Users/[UsersName]/.pyenv/versions/3.7.5/lib/python3.7/site-packages/kivy/core/text/text_pygame.py line 36.Called from /Users/[UsersName]/.pyenv/versions/3.7.5/lib/python3.7/site-packages/kivy/uix/label.py line 349 by _create_label().
[INFO   ] [Base        ] Start application main loop
[INFO   ] [GL          ] NPOT texture support is available