Changes made to the most test settings (such as test password, test duration, and score) take immediate effect for the candidates. Therefore, candidates who are logged on to the test are also impacted by them.
If you have changed the test to a dynamic test during the test session, then it does not take effect for the candidates who are logged in this test session. This is because any change in sequence of questions does not take effect during a test session.
However, all changes will take effect for the candidates who log on to the test after these changes are made.