Your puzzles settings can be found here: https://www.chess.com/settings/tactics

Or, click on the 'settings' icon on the bottom left of any page on Chess.com:

Then choose Puzzles from the menu on the left.

See below for an explanation of each setting option.

​Show Details - Choose whether you want the puzzles to come automatically, or if you want to have to click 'next' for a new puzzle. You can choose to stop after each problem, stop only after wrong problems, or to never stop and always be given a new puzzle.

Show Timer - Choose whether to show the timer or not. This is the timer that starts counting up once each new puzzle appears.

Reset Rated Training History - This button will delete all your puzzle training data. It will be as if you have never played any puzzles on the account. You will keep any puzzles achievements you have already unlocked.

Reset Puzzle Rush History - This button will delete all your Puzzle Rush data. It will be as if you have never played Puzzle Rush on the account. You will keep any Puzzle Rush achievements you have already unlocked.

Reset Endgames History - This button will delete all your Endgames progress. It will be as if you have never done any Endgames training before.

Reset Practice Positions - This button will reset all your Practice progress. It will be as if you have never used the Practice feature before.