A presentation is a collection of scenes and sources. After you finishing creating a presentation it is highly recommended to save the presentation. In case you lose a presentation by accident you can hold down the shift key while logging into XSplit Broadcaster which will pop up a menu with a variety of options. Select the second option “Load a previous system backed up presentation” and user the drop down menu to find your previous presentation.
Another tip is that you can load different presentations while streaming and/or recording. This is a good way to expand the amount of scenes you can use.