How to change left margin of list items in demo

[mobiRic]

I've been working through the demo and still can't figure out where the margin of the main items gets set. More specifically, the text_line_item.xml is inflated and has an offset applied to it - I want to change that offset.

I have modified the example to use LinearSLM instead of the grid:

public void onBindViewHolder(CountryViewHolder holder, int position) {
    final LineItem item = mItems.get(position);
    final View itemView = holder.itemView;

    holder.bindItem(item.text);

    final LayoutManager.LayoutParams lp = LayoutManager.LayoutParams.from(itemView.getLayoutParams());
    lp.setSlm(LinearSLM.ID);
    lp.setFirstPosition(item.sectionFirstPosition);
    itemView.setLayoutParams(lp);
}

Thx

[mobiRic]

Closing: I found the property app:slm_section_headerMarginStart in header_item.xml.