Left/Right Header Width
Intensity uses a 12 column grid system. Below you can pick how many columns to use for the sidebars when they are enabled. The size of the content area will be calculated based on the number of columns left over. If there are zero or less columns left over, the content will be a full 12 columns wide.
For example, if the left and right sidebars are enabled and set to size 3, then the content will be “total number of columns” – “left sidebar columns” – “right sidebar columns” or 12 – 3 – 3 = 6 columns wide.
The following options are the same for both the right and left sidebars, so the options are only being listed once, but you can control both sidebars in Intensity.