I am using MySQL Workbench 5.2, the newest version as far as I know, but I simply cannot change the font. It is very inconvenient, because the default font is very small an
Similarly for Mac OS X using the hidden path below (ref: this link):
"You can edit the preferences directly in their XML files. Shut down MWB. Then edit the file ~/Library/Application Support/MySQL/Workbench/wb_options.xml. Look for the key workbench.general.Editor:Font, and change the font there. Now restart MWB to see your change."