No matter what the puzzle type, "Show constraints" is checked in the View menu when FoldIt is opened.
If I uncheck it, it's checked again when I switch puzzles or switch tracks.
Abou 90% of the time, there are no constraints that show when the box is checked.
This is intended behavior. Constraints won't always be there, but we'd like you to see them if they exist on a puzzle.
If you always want to Show Constraints you may want to either:
Question answered (I believe!) - closing this, please reopen if you need more information or assistance.