@tgnelsgolf the preview/web browser can be opened by sliding any where on screen except for on the toolbar. In other words you can open it by sliding from the middle of the screen and this should help to reduce the conflict of ios9 features.
Remember that the current version of Editorial was made pre iOS 9, so when it was made it did not need to cater for anything in relation to the features that iOS 9 added. Updating an application like Editorial takes time.