I recently purchased an ipad and downloaded the app. I am really lost with it. I have some other bible study apps and they seem to be fairly easy to use and figure out. I can't figure out how to close a book. I have set the ESV as my preferred Bible but it keeps opening the Lexham Bible. I want to read a certain book with the ESV open and can't figure out how to do that. It should be fairly easy to it and to switch display - one book or multiple books etc. The tutorial on the webpage sells the app but doesn't tell us how to use it. Is there any training materials on using the ipad app?