Julien Rioux <jrioux <at> physics.utoronto.ca> writes: > > In Document > Settings > Preamble you can add > > \lstset{breaklines=true} >
You can also right click on the inset (the box), click Settings..., and put a check mark next to "Break long lines" in the Style section of the Main Settings tab. Julien's approach is less work if you are going to have a number of program listing insets and want to allow line breaking in all of them. /Paul