how to delete/remove books?

Hi Marcus, and welcome to the forums

Do you mean "how do I remove books that I have downloaded" or "how do I remove books from my actual library"?

The reason I ask is that with the android device you can access all mobile-enabled resources which you have purchased through the Internet.

If you want to remove books you have downloaded, just find the book in the library, press on the small arrow on the right hand side and press Remove.

Rmoving books from your wider library is more difficult and you really need to contact logos for that.

What are you actually wanting to achieve?

Graham

I noticed the remove button is missing on the ASV Bible, which I installed earlier. Without the "remove" button, how do I go about remove the book from my Android Phone?

The ASV is considered an "essential" part of the application and cannot be removed.