In addition to Mae_Jakob_Ka's suggestion, if you'd like to quickly change the playback mode for all of your lessons, do try the Override function. This will also make it easier to change your playback settings again (if you want to change it later on), because you'll only need to set these in one window instead of changing the settings for each lesson one by one.
Please have a look at this article for details on how to use the Override function:
http://support.brillkids.com/entries/20586937-how-to-change-playback-settings-for-all-little-reader-lessons