You can’t actually switch leaders, your current leader must be disposed of by either exiling or death before a new leader can be chosen. Switching maps does not reset your leadership position in your community but does reset the legacy missions I believe.
What happens if you demote a leader?
About the Leaders Choosing a leader is not permanent, you can demote them in case you want to assign another survivor as the community’s leader, however the demoted survivor will drop back into a citizen. They’ll also suffer a morale penalty, but it will disappear after a while.
What do change leaders need to do?
These 3 C’s unite effective change leadership: