Specify innertheme for an rmarkdown beamer presentation

Question

The default bullets in the AnnArbor theme are ugly bullet points I want to switch for the cleaner arrow type bullet points in the default theme. Do you know how I can specify the innertheme for rmarkdown's beamer presentation in R?

Answer 1

R Markdown often includes easy to access options to be used in the yaml front matter. However, in the event that such an option has not been made available, we can always resort to header-includes to include arbitrary LaTeX code in the preamble.

Here's how you could use that to change the innertheme :

---
title: "Untitled"
output: beamer_presentation
header-includes:
    - \useinnertheme{rectangles}
---