How to set maximum expanded height in android support design bottom sheet?

to stop the bottom sheet from moving up the full screen is simple, just set a layout_height for your NestedScrollView to 500dp, also you probably want to set it’s layout_gravity="bottom"

<android.support.v4.widget.NestedScrollView
    android:id="@+id/design_bottom_sheet"
    android:layout_width="match_parent"
    android:layout_height="500dp"
    android:background="#000000"
    android:layout_gravity="bottom"
    app:behavior_hideable="true"
    app:behavior_peekHeight="100dp"
    app:layout_behavior="android.support.design.widget.BottomSheetBehavior">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginBottom="5dp"
            android:background="#e444ff" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginBottom="5dp"
            android:background="#e444ff" />

        <TextView
            android:layout_width="match_parent"
            android:layout_height="100dp"
            android:layout_marginBottom="5dp"
            android:background="#e444ff" />

    </LinearLayout>

</android.support.v4.widget.NestedScrollView>

if you don’t want the view to be draggable up then you need to set behavior_peekHeight and layout_height to the same values.

And to stop the view from being draggable down is the behavior_hideable flag just set this to false