Is it normal in Pineapple OFC for your chips to be locked once a hand starts, with no option to leave the game mid-hand? A friend of mine lost $20 because he didn’t know the rules and couldn’t exit after joining the table. Is this standard behavior for OFC, or does it vary by site?

Welcome to Pineapple OFC, the version of Open Face Chinese Poker in which players make hands that are twice as big in half the rounds, where Fantasyland is not just possible but standard, and where you get a 14th chance at quads or a straight flush.
https://www.pokernews.com/poker-rules/pineapple-open-face-chinese-poker.htm#:~:text=Welcome%20to%20Pineapple%20OFC%2C%20the,quads%20or%20a%20straight%20flush.