If you use the Google Books application on your Apple iPhone to access the huge collection of Google eBooks, you’ll notice that there is an update available to bump the version number to 18.104.22.1687.
The refresh brings new features and improvements like in the case of the “Find” function which highlights matches as you scroll down to read the book. There are also overall application speed improvements and some bug fixes in addition to what’s been added. There’s also one thing that’s been removed and that’s the magnifier. Follow the source link to download or update or just check for updates on your App Store.