I'm currently in the process of writing on my PhD-thesis. According to my uni's theses formatting guidelines, font size should be 13 pt.
The thesis document class is set to report, which only takes 10pt, 11pt and 12pt as input.
Now, I found this solution, which seems to address my problem. I added the two suggested commands: \fontsize{13}{\baselineskip} and \selectfont, but there's no change in the font size in my document. What am I doing wrong?
If it help, I've added my document layout below. The added lines are at the beginning of %Styles.
\documentclass[12pt,twoside, openright]{report}
%Packages
\usepackage[a4paper,width=150mm,top=25mm,bottom=25mm,bindingoffset=6mm]{geometry}
%\usepackage[utf8]{inputenc}
\usepackage{graphicx}
%\usepackage{anyfontsize}
\usepackage[T1]{fontenc}
\usepackage{libertine}
\usepackage{sectsty}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{fancyhdr}
\usepackage[backend=biber, style=apa]{biblatex}
\usepackage[english]{babel}
\usepackage{xcolor}
\usepackage{pdfpages}
\usepackage{setspace}
%Paths
\graphicspath{ {images/} }
\addbibresource{references.bib}
%Styles
%Added lines
\fontsize{13}{\baselineskip}
\selectfont
%Existing style commands
\allsectionsfont{\sffamily}
\onehalfspacing
\pagestyle{fancy}
\fancyhead{}
\fancyhead[RO,LE]{Thesis title}
\fancyfoot{}
\fancyfoot[LE,RO]{\thepage}
\fancyfoot[LO,CE]{Chapter \thechapter}
\fancyfoot[CO,RE]{Author}
\renewcommand{\headrulewidth}{0.4pt}
\renewcommand{\footrulewidth}{0.4pt}
\raggedbottom
%Thesis information
\title{Thesis Title}
\author{Author Name}
\date{\today}
%Document start
\begin{document}
\normalsizeyour changes are gone, and that command is used al overthe place. The koma classes might have a 13pt option out of the box. The memoir class does not out of the box, but you can copy the macro file behind the 12pt option, rename it, adjust it to fit 13ptand then have memoir use that file. – daleif Feb 17 '20 at 21:26