In this day and age, especially in the west. There has been an increase of transgenders.

In regards to those who were born male but are now transitioning to a female as their beliefs. What is the ruling of a Muslim woman’s hijab from someone who was born a male but is saying she is a female now. & if any, what precautions must one take when a transgender shares the same public toilets as the other women, or generally who mixes in with females.

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Since the transformation available at this time is only formal and not realistic, hijab must be taken care of by a Muslim woman in front of someone who knows that he is a male transformed into a (female).
And also not shaking hands.
As for the shared toilets, as long as they are isolated, and the other side cannot be seen, there is nothing wrong with them, taking into account that the legs are not visible, for example.