[Python] Adjust the position of the gridlayout in kivy

I create an UI displaying 6 states (cols:3 /rows:2). I'm using the GridLayout feature and 6 MDCard equalivents for 6 states I ưant want to display to the user. The problem I met is that I cannot adjust the position of these states in the middle of the screen. I'm using the Kivy framework

from kivy.lang import Builder
from kivy.properties import ObjectProperty

from kivymd.app import MDApp
from kivymd.uix.scrollview import MDScrollView

KV = '''
<ContentNavigationDrawer>

MDList:

OneLineListItem:
text: "Screen 1"
on_press:
root.nav_drawer.set_state("close")
root.screen_manager.current = "scr 1"

OneLineListItem:
text: "Screen 2"
on_press:
root.nav_drawer.set_state("close")
root.screen_manager.current = "scr 2"


MDScreen:

MDTopAppBar:
pos_hint: {"top": 1}
elevation: 4
title: "MDNavigationDrawer"
left_action_items: [["menu", lambda x: nav_drawer.set_state("open")]]

MDNavigationLayout:

MDScreenManager:
id: screen_manager

MDScreen:
name: "scr 1"
GridLayout:
cols: 3
rows: 2
padding: "10dp" # Optional: Padding inside the grid
spacing: "1dp" # Optional: Spacing between items
size_hint_y: None # Thay đổi kích thước theo chiều cao
height: self.minimum_height # Đặt chiều cao tối thiểu

MDCard:
size_hint: None, None
size: "200dp", "200dp"
MDLabel:
text:"item1"

MDCard:
size_hint: None, None
size: "200dp", "200dp"
MDLabel:
text:"item2"
MDCard:
size_hint: None, None
size: "200dp", "200dp"
MDLabel:
text:"item3"

MDCard:
size_hint: None, None
size: "200dp", "200dp"
MDLabel:
text:"item4"

MDCard:
size_hint: None, None
size: "200dp", "200dp"
MDLabel:
text:"item5"

MDCard:
size_hint: None, None
size: "200dp", "200dp"
MDLabel:
text:"item6"


MDScreen:
name: "scr 2"

MDLabel:
text: "Screen 2"
halign: "center"

MDNavigationDrawer:
id: nav_drawer
radius: (0, 16, 16, 0)

ContentNavigationDrawer:
screen_manager: screen_manager
nav_drawer: nav_drawer
'''


class ContentNavigationDrawer(MDScrollView):
screen_manager = ObjectProperty()
nav_drawer = ObjectProperty()


class Example(MDApp):
def build(self):
self.theme_cls.primary_palette = "Orange"
self.theme_cls.theme_style = "Dark"
return Builder.load_string(KV)


Example().run()


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