fedilab-Android-App/app/src/main/res/drawable-anydpi/ic_expand_less.xml

<vector xmlns:android="http://schemas.android.com/apk/res/android"
    android:width="24dp"
    android:height="24dp"
    android:viewportWidth="24.0"
    android:viewportHeight="24.0">
    <path
        android:fillColor="#FFFFFFFF"
        android:pathData="M12,8l-6,6 1.41,1.41L12,10.83l4.59,4.58L18,14z" />
</vector>