New, much easier way to switch user profiles in MB Classic
Starting with version 18.104.22.168 it will be much easier to manage a mult-user profile setup with MBC. As each theme gets it implemented, you should have an easy button somewhere on the interface to allow you to select a different user profile than the one you are currently within.
The below images show where this button is in chocolate and the default theme. Subdued also implements this new feature. If you don't use one of those themes, ask your theme dev to get this into your favorite theme as soon as they can.
This will make it much easier to manage multiple users and parental control settings. You can configure each MBC installation to automatically log on to the profile you use most often and then easily switch between it and other profiles as you wish. The next start of MBC will then go into your default profile again.