Where can I view existing users?

You can manage your users in Settings, under the Users tab.

This section is available to administrators or users with unrestricted access rights.
By default, the main page of the section displays a list of all active or blocked users. You can see the type of user, the access level of each user, the time the user last logged in to the platform, etc. In the settings you can choose what information you want to view about users.