You can configure ARIS so that it suits your needs.
Depending on your administrator privileges, you have access to the described areas. For example, you can see the user administration only if you have the User administrator function privileges.
If you are not yet familiar with this topic, why not log on to the Software AG Learning Portal and take a look at a product training course? Many basic trainings are free of charge, such as ARIS Administrator Basic (E735A-77E).