To change the preferences, click the 'i' symbol in the bottom-right of the widget or hit the 'I' key.
prefs1.png Current Collection
Change the current collection here. ChessPuzzle currently has six great collections containing 6,237 puzzles. You may also begin a new game here.

Engine
Auto-Move: If this is on, the engine will move after each of your moves.
Show Pondering: If this is on, pondered engine moves will be displayed.
Seconds Per Move: Set the number of seconds (1-20) the engine thinks for each move. On decent hardware, 2 or 3 seconds should be enough.
Feedback
Audio: If this is on, you will hear sound.
Visual: If this is on, you will see feedback for correct & incorrect solutions, and game resolution.
Tooltips: If this is on, you will see tooltips for the buttons on the front of the widget.

Board
Show Last Move: If this is on, the last move made is highlighted with blue borders.
Auto-Flip: If this is on, the board will automatically flip to put the side to move on the bottom.
Board Style: There are 5 board styles to choose from.
prefs2.png