This is an experiment using that removes the horizontal menu bar and uses the Collection Index pagelets to create a vertical menu system.
I have used the data of the [opalzoap.com] site that I worked on for Annie from Opalz and which uses the same site structure.
The font size in the Sidebar pagelet was increased using:
Site > Site Code Injection... > Head Area [bottom box]
... and the CSS adjustment:
<style type="text/css"> #sidebar { font-size: 1.1em; } </style>
Adjust the dot-em size. Point-one of an em makes a big difference.