The Difficulty option is dumb a bit but I set it to Extra Hard once long time ago and never touched it again
As for the Speed bonus: just dont pay attention on this feature
Puzzle goals and Chat hints can be hidden via Settings > Gameplay > Puzzles
There is the Hint button that shows the next move only
Something is really wrong with the direction where puzzles are going.
Difficulty:
The default setting for puzzle difficulty is standard which in fact is very easy and you get this +2/-20 rating change, to get somewhat challenging you need to choose extra hard, which is not, extra hard puzzles should be rated much higher than your current rating. Default setting should give you puzzles at about your rating.
Speed bonus:
Having a speed bonus discourages players from thinking about the puzzles. I want to find the best move, if i want to do it fast i can go to puzzle rush. There should be a setting to turn it off.
The tip on the side:
It is not necessary to give you a hint what is the puzzle theme, the only necessary information is who's move is next.
Show solution:
It is unnecessary to slowly show all the moves from the beginning, if i click show solution i want to see one move from the position i am stuck at and i want to understand it, if i need further hints I want to navigate through the moves myself.
There are other things like repeating puzzles, etc. all this just forces me to go solve puzzles somewhere else.
Are you sure your UI/Product team even solve puzzles themselves?