[Tex/LaTex] Make all fonts in beamer presentation larger

beamerfontsizeknitr

I'm working in R and knitting my output into a beamer presentation (The script below can be copied into an R script). My titles are naturally larger than the main text. However, I would like everything to be larger, meaning that I don't want everything the same font size, but everything one font larger compared to what it is now: 

#' ---
#' title: "title"
#' subtitle: "Subtitle"
#' author: |
#'   | Me
#' institute: University
#' date: January, 2018
#' header-includes:
#'   - \usepackage{array}         # #' fontsize: 13pt
#'   - \usepackage{multicol}
#'   - \usepackage{fontspec}
#'   - \setmainfont{Montserrat Bold}
#'   - \setsansfont{Roboto Light}
#' output: 
#'   beamer_presentation:
#'     toc: no
#'     slide_level: 2
#'     fig_caption: false
#'     latex_engine: xelatex
#' ---
#' ## Contents
#' 
#' \tableofcontents
#' 
#' # Introduction
#' 
#' ## More Text
#' 
#'  
#' ## Title
#' 
#' - Part I 
#' - Part II
#' - Part III
#'

Changing the font size as I have it now doesn't work. Any suggestions on what I need to change?

Best Answer

In order to load a fontsize of 14, you have to have the extsize package installed.

From beamer manual :

\documentclass[14pt]{beamer}

Makes all fonts somewhat bigger. Requires extsize to be installed.

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