google-material-design-icons/android/action/minimize/materialiconsround/black/res/drawable/round_minimize_20.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="20dp"
    android:height="20dp"
    android:viewportWidth="20"
    android:viewportHeight="20"
    android:tint="?attr/colorControlNormal">
  <path
      android:fillColor="@android:color/white"
      android:pathData="M6.75,15.5h6.5c0.41,0 0.75,0.34 0.75,0.75l0,0c0,0.41 -0.34,0.75 -0.75,0.75h-6.5C6.34,17 6,16.66 6,16.25l0,0C6,15.84 6.34,15.5 6.75,15.5z"/>
</vector>