Decent puzzle app

I am playing on an iPad mini, the app needs to allow locking the puzzle at desired sizes. It downsizes the puzzle to a size that is unplayable whenever new pieces are brought on the board. I also lost the border once because it decided to organize the board better than I had it and had to scroll all around to look for it. That was frustrating. On the other hand the sorting bar is great, the option to orient pieces is nice and the choice of puzzles is good.

Avas Grandma about Ravensburger Puzzle, v1.5