Myer's-Briggs is not a personality test, it is a preference indicator. It helps to explain behavior - why do people do the things they do or why do people make the choices/preferences they make.
Different situations may call for different choices thus different behaviors may occur. People do have a core set of preferences in each area but have the option of changing if the situation calls for it.
For example, E/I is where do we get energized from, our outer world or our inner world? But different social situations will call for different responses to each.
MBTI was never meant to typecast people, it was meant to understand why do WE do the things we do, and hopefully gain a better understanding of of other people's preferences instead of judging them.

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