Owen Evans writes
Read this blog post for what's new with Story Maps in the April 2018 update to ArcGIS Online...
For a visual comparison of the three layout options that are now available in Story Map Tour, including the new Side Panel layout option, see the Story Map Tour home page. For some FAQs about the new Side Panel layout option, start reading here on the Story Maps FAQ page.
The new Side Panel layout option in the Story Map Tour app template features a full-screen cover page so you can start your tour with a real splash! Click the screenshot or this link to try out the new look.