google-material-design-icons/android/device/splitscreen/materialicons/black/res/drawable/baseline_splitscreen_24.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24"
    android:viewportHeight="24"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M18,4v5H6V4H18M18,2H6C4.9,2 4,2.9 4,4v5c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2V4C20,2.9 19.1,2 18,2zM18,15v5H6v-5H18M18,13H6c-1.1,0 -2,0.9 -2,2v5c0,1.1 0.9,2 2,2h12c1.1,0 2,-0.9 2,-2v-5C20,13.9 19.1,13 18,13z"/>
</vector>