I’m using GoodReads right now and I hate that I can’t add one book to a shelf without removing it from another.
No. I mean you got exclusive shelves, and of those you can yeah, only had to one, and they are like 3 default ones, but you can create any other number of shelves, make them exclusive or not and add any book to any number of non exclusive shelves and one of the exclusice shelves.
go to my books and edit shelves and see if you got make exclusive checked on shelves you can remove it from! (You can not from at least 3, which is “read” and “currently reading_” and “want to read” but all else I think does not have to be exclusive)
If you are using your mobile phone, do not use the app, use the site on your mobile phone browser. That is better for everything really, not just goodreads. Apps are made to run on the lowest common denominator of hardware and often are so crippled…
I do not know what a reading app is, and well, if it is run on really weak hardware it makes sense they can not design apps to be as good as the ones to run on desktop. Try the desktop site on your phone and bookmark it to your phone main screen as if it were an app. You will have much more features. And goodreads is far far better, different class at listing all possible editions, ebook or audio or translations of a book than storygraph…