In the settings screen the following settings can be adjusted:
Change BlindChess Level: change the number of blindmoves for the blindchess challenge. A depth of 4 means 4 blindmoves for white and 4 blindmoves for black.
Change Colors: change the colors for the white and black fields
Remove repetitions: removes the set of repetitions. In the home screen you can choose the option Repetitons. This set contains all the problemns that you have answered wrong.
These problems do not count for statistics, and all solely for training purposes.