Objective:
I would like to resize my legend boxes in the Section Layout. It seems the section tool does not allow me to stretch the legend box.
Resolution:
There is not a stretch tool for the legend editor. You can however control the size of the text by clicking 'Edit Styles' on the 'Legend Group' tab. And you can also change the swatch size of the legend by adjusting the 'Colour Swatch Size' for its height and width independently. The legend box will automatically adjust to fit the individual elements.
More information can be found here: Section Layouts