Yaron Y. Goland wrote: [...]
YaronP.S. Does anyone know a decent margin setting for letter size paper so when I produce a PDF my article doesn't have insanely large margins?
Document->settings->margins. Then set the margin sizes to whatever you like. Note that it is generally not a good idea to have much more than 66 letters per line, which is one reason for large margins. A larger/wider font may therefore be a good idea if you go for really thin margins. Helge Hafting