Signal-Android/app/src/main/res/layout/group_call_call_full.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    tools:viewBindingIgnore="true"
    android:layout_height="match_parent"
    xmlns:tools="http://schemas.android.com/tools"
    android:background="@color/transparent_black_40"
    android:gravity="center"
    android:orientation="vertical"
    android:padding="16dp">

    <TextView
        style="@style/TextAppearance.Signal.Body1.Bold"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/WebRtcCallView__call_is_full"
        android:gravity="center"
        android:textColor="@color/core_white" />

    <TextView
        android:id="@+id/group_call_call_full_message"
        style="@style/TextAppearance.Signal.Body1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        tools:text="The maximum number of 16 participants has been reached for this call. Try again later."
        android:gravity="center"
        android:textColor="@color/core_white" />

</LinearLayout>