public void removeAllSections() {
        this.sections.clear();
        this.sectionViewTypeNumbers.clear();
        this.sectionAdapters.clear();
        this.viewTypeCount = 0;
    }
Remove all sections from this adapter.
library/src/main/java/io/github/luizgrp/sectionedrecyclerviewadapter/SectionedRecyclerViewAdapter.java