Не работает функция в Kivy

Создаю приложение на kivy. Пытаюсь сделать чтобы при нажатии на кнопку удалялся предыдущий макет(layout) с его кнопками и картинками и появлялся новый со своими виджетами. Но функция работает некорректно и тут два варианта: либо новый макет(layout) с его виджетами появляется но кнопка на которой привязана функция остается, либо кнопка на которой привязана функция удаляется, но новый макет(layout) с его виджетами не появляется. Что делать? Я хочу чтобы эта кнопка уходила и появлялся layout с картинкой.

from kivy.uix.image import Image
from kivy.uix.button import Button
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.floatlayout import FloatLayout

from kivy.config import Config
Config.set('graphics', 'width', '360')
Config.set('graphics', 'height', '748')
Config.set('graphics', 'resizable', False)
 
homePageLayoutPlaced = False


class SimpleApp(App):
    def build(self):
        self.title = 'Quizop'
        self.icon = 'qzpico.ico'
        

        mainlayout = FloatLayout(size=(360, 748))
        
        backgroundImage = Image(source="background.png", pos=(0, 0))
        bottomBar = Image(source='bottombar.png', pos=(0, -346))
                                                                           
        bottomBarHomeButton = Button(background_normal='white-home.png', size_hint=(None, None), pos=(24, 14), size=(32, 32))
        bottomBarInternetButton = Button(background_normal='white-internet.png', size_hint=(None, None), pos=(162, 14), size=(32, 32))
        bottomBarAccountButton = Button(background_normal='white-account.png', size_hint=(None, None), pos=(300, 14), size=(32, 32))


        bottomBarHomeButton.bind(on_press=self.openHomePageCmd)
        bottomBarAccountButton.bind(on_press=self.openManagePageCmd)


        mainlayout.add_widget(backgroundImage)
        mainlayout.add_widget(bottomBar)

        mainlayout.add_widget(bottomBarHomeButton)
        mainlayout.add_widget(bottomBarInternetButton)
        mainlayout.add_widget(bottomBarAccountButton)
        return mainlayout

    
    def openHomePageCmd(SimpleApp, self):
        global homePageLayoutPlaced
        if homePageLayoutPlaced == True:
            return

        global homePageLayout
        homePageLayout = FloatLayout(size=(360, 688))

        global homePageWelcomeMessageImage
        homePageWelcomeMessageImage = Image(source='welcomebgru.png', size_hint=(None, None), size=(320, 141), pos=(20, 580))

        global homePageCreateQuizButton
        homePageCreateQuizButton = Button(background_normal='createquizbtnru.png', size_hint=(None, None), pos=(20, 500), size=(320, 60))
        
        global homePageStartQuizButton
        homePageStartQuizButton = Button(background_normal='startquizbtnru.png', size_hint=(None, None), pos=(20, 420), size=(320, 60))
        
        global homePageDeleteQuizButton
        homePageDeleteQuizButton = Button(background_normal='deletequizbtnru.png', size_hint=(None, None), pos=(20, 340), size=(320, 60))
        
        global homePageImportQuizButton
        homePageImportQuizButton = Button(background_normal='importquizbtnru.png', size_hint=(None, None), pos=(20, 260), size=(320, 60))
        
        global homePageExportQuizButton
        homePageExportQuizButton = Button(background_normal='exportquizbtnru.png', size_hint=(None, None), pos=(20, 180), size=(320, 60))
        
        global homePageShareQuizButton
        homePageShareQuizButton = Button(background_normal='sharequizbtnru.png', size_hint=(None, None), pos=(20, 100), size=(320, 60))



        homePageLayout.add_widget(homePageWelcomeMessageImage)

        homePageLayout.add_widget(homePageCreateQuizButton)
        homePageLayout.add_widget(homePageStartQuizButton)
        homePageLayout.add_widget(homePageDeleteQuizButton)
        homePageLayout.add_widget(homePageImportQuizButton)
        homePageLayout.add_widget(homePageExportQuizButton)
        homePageLayout.add_widget(homePageShareQuizButton)

        homePageCreateQuizButton.bind(on_release=SimpleApp.openCreateQuizCmd)
        


        self.add_widget(homePageLayout)

        
        homePageLayoutPlaced = True
    


    def openCreateQuizCmd(SimpleApp, self):
        global createQuizNameLayout
        createQuizNameLayout = FloatLayout(size=(360, 688))


        global createQuizNameImage
        createQuizNameImage = Image(source='namequizru.png', size_hint=(None, None), size=(320, 60), pos=(20, 660))


            
        homePageLayout.remove_widget(homePageWelcomeMessageImage)


        homePageLayout.remove_widget(homePageCreateQuizButton)
        homePageLayout.remove_widget(homePageStartQuizButton)
        homePageLayout.remove_widget(homePageDeleteQuizButton)
        self.add_widget(createQuizNameLayout)
        createQuizNameLayout.add_widget(createQuizNameImage)
        homePageLayout.remove_widget(homePageImportQuizButton)
        homePageLayout.remove_widget(homePageExportQuizButton)
        homePageLayout.remove_widget(homePageShareQuizButton)


    

    def openManagePageCmd(SimpleApp, self):
        managePageLayout = FloatLayout(size=(360, 688))

        global homePageLayoutPlaced
        if homePageLayoutPlaced == True:
            homePageLayout.remove_widget(homePageWelcomeMessageImage)

            homePageLayout.remove_widget(homePageCreateQuizButton)
            homePageLayout.remove_widget(homePageStartQuizButton)
            homePageLayout.remove_widget(homePageDeleteQuizButton)
            homePageLayout.remove_widget(homePageImportQuizButton)
            homePageLayout.remove_widget(homePageExportQuizButton)
            homePageLayout.remove_widget(homePageShareQuizButton)

            self.remove_widget(homePageLayout)


            homePageLayoutPlaced = False
            



        self.add_widget(managePageLayout)


    

 
if __name__ == "__main__":
    SimpleApp().run()```