How do I calculate the conjugation for the whole expression?

This is probably a stupid question, but I haven’t found a solution.
I need to conjugatе some sum of terms. Wolfram Mathematica does this for short sums, but not for long sums. How do I perform the conjugation for the whole expression?

You can try ComplexExpand:

ComplexExpand[Conjugate[A + B + F]]

Maybe FullSimplify[Conjugate[A + B], Ass] leaves an explicit Conjugate because this way the expression is “simpler” than what you would get by expanding the conjugations, as in

FullSimplify[Map[Conjugate, A + B + F], Ass]

FullSimplify[ComplexExpand[FullSimplify[Conjugate[A + B + F], Ass]], Ass]

gives correct result but this recept looks weird and unrobust.

FullSimplify[Map[Conjugate, A + B + F], Ass]

looks great!