@Skrrr
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Btw, if you go to "Squad" and then tap MRL (Morale) twice, the players will be organized by their morale, in a descending order. Now even if you have players who's morale is superb, you will be able to see who's morale is actually lower or higher.

P.S.
You still know who's unhappy, keep your players in the green and they will be happy. Take morale as if it's stage-based - Very Good and Superb is what you want.