collapsed TOC in R Notebook

Question

I can't seem to get collapsed: FALSE in r-markdown's html_notebook.

With the below YAML I do not get at collapsed TOC.

---
title: "R Notebook TEST"
output:
  html_notebook:
    toc: yes
    toc_float: TRUE
    collapsed: FALSE
    theme: flatly
 ---

Did I overlook something in the manual?

Answer 1

Fix your indentations in your YAML header, i.e.:

---
title: "R Notebook TEST"
output:
  html_notebook:
    toc: yes
    toc_float:
      collapsed: FALSE
    theme: flatly
---

This works for me: