Recycle view - example

[ZZerog]

try change length of a each list in the Section items in your example. Something like:

adapter.addSectionItem(
      SectionItem("Title0", R.color.colorPrimary, arrayListOf("item0"))
)
adapter.addSectionItem(
      SectionItem("Title1", R.color.md_yellow_100, arrayListOf("item0", "item1", "item2", "item3"))
)
adapter.addSectionItem(
      SectionItem("Title2", R.color.md_amber_700, arrayListOf("item0", "item1", "item2"))
)

Now a ExpandableLayout start to show empty items.