make room for multicols

preamble.tex

@@ -5,6 +5,7 @@
 \usepackage{dingbat} % for curly section symbols
 \usepackage{appendix}
 \usepackage{geometry} % changes page borders
+	\geometry{margin=50pt}
 \usepackage{svg}
 \usepackage{alltt}
 	\svgsetup{width=\textwidth}
@@ -84,7 +85,7 @@
 {8pt}
 {\Large\bfseries\filcenter}
 
-\titleformat{\subsection}{\needspace{4cm}\large\bfseries}{}{1em}{}[\rule{.5\textwidth}{.2pt}]
+\titleformat{\subsection}{\needspace{2em}\large\bfseries}{}{1em}{}[\rule{.9\linewidth}{.2pt}]
 %
 \titleformat{\subsubsection}
 {\normalfont\normalsize\bfseries}{\thesubsubsection}{1em}{}