eBooks that haven't been downloaded onto your device will appear transparent in your bookshelves. Once they are downloaded, they will appear solid.
Tap and hold on an eBook you'd like to move. Drag and drop it on another shelf.
Tap on the [Edit] button in menu to enter the edit mode. Once in edit mode, you will find the [x] mark above eBooks. Tap on the [x] mark above the ones you'd like to delete from your device. Options below will be indicated.
To delete just the eBook content, but leave the thumbnail in bookshelf:
Tap on the [Delete only the content] button.
To delete the eBook content, as well as the thumbnail in bookshelf:
Tap on the [Yes] button.
Tap on the [No] button.
*Deleting just the eBook content, but leaving the thumbnail in bookshelf is meaningful when you just need to make more disk space available on your device.
*To read deleted eBook again, simply tap on the thumbnail. It will then be downloaded and synced.
Switch How eBooks Appear in Shelves
Double tap on an eBook to switch how it appear in the shelf, either show the spine or show front cover.