How can I add a custom legend into the main stage map of my story map?

[KatieWhite1]

How can I add a custom legend into the main stage map of my story map? OR edit the size of the the default drop down legend. My legend items are wordy and therefore hard to read with the preset legend scale. Here is an example of what I would ideally like to do:

[AdrianWelsh]

Hi Katie,

Are you willing to mess with the coding within this story map? There is a brief example of how to modify a legend via JavaScript here:

Legend | ArcGIS API for JavaScript

Tagging: ArcGIS API for JavaScript Web Developers