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It's been a test feature, like the speed button and just about everything else in the game. Nothing is permanent in Candy Crush and few feature are rolled out to every player. Most players never got the view button. You were in a test group that got it. If the test group spend more gold after having assessed the board, then they may roll it out to more players, if the test showed that fewer players spent gold to play on, then the feature won't come back.
@nrgfizzle I wouldn't say I was loving it, but I did find it useful a couple of times. My 'View Board' has gone now as well.
As Christine said, it was just a test so the disappearance means either that the test has moved to another group of people, or it has been stopped