1, default font size
tools->option->advanced
set in developer mode.....
currently it works, it later want to figure it out, below are some links
http://social.technet.microsoft.com/Forums/en-US/visiogeneral/thread/0e79f02c-071e-47c7-b3da-2b3319228a39/
http://www.visguy.com/2008/08/04/top-9-reasons-for-turning-on-developer-mode/