Changing theme at runtime from fragment in android kotlin

Question

I have created an activity. The activity's layout contains FragmentContainerView element.

                   <androidx.fragment.app.FragmentContainerView
                    android:id="@+id/nav_host_container"
                    android:name="androidx.navigation.fragment.NavHostFragment"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    app:defaultNavHost="true"
                    app:layout_constraintBottom_toBottomOf="parent"
                    app:layout_constraintEnd_toEndOf="parent"
                    app:layout_constraintStart_toStartOf="parent"
                    app:layout_constraintTop_toTopOf="parent"
                    app:navGraph="@navigation/main_navigation_graph" />

I am showing a fragment into this container using the following code,

val navHostFragment = activity?.supportFragmentManager?.findFragmentById(R.id.nav_host_container) as NavHostFragment
val navController = navHostFragment.navController
navController.navigate(destinationID)

Here i am showing a fragment named as HomeFragment. The home fragment layout contains a linear layout. 50% of space is given to ViewPager2 and 50% is given to a group of 4 buttons, both these layouts are separated vertically. Currently there are multiple items in my viewpager2 and i am looking to change the Ui of these 4 buttons according to the item in the viewpager2. The meaning of changing Ui is to change/switch the entire theme of the fragment or activity at runtime. I have been checking solutions on stack where answers are given to change the theme using styles in OnCreateView before super is called. However it is quite complicated to change the style as i have only one fragment loaded in ContainerView. Hence my question is, can we apply a style to the layout and just change the style of the entire layout on runtime easily or is there any better solution to this ?