Answer:
You can access the General Data using the menu "Edit" → "Model Data" → "General Information"; see Image 01.
As an alternative, you can right-click "Model Data" in the Data navigator and select "General Data" in the shortcut menu; see Image 02.
In the dialog box, you can then adjust the Description or the Model Type (plane, spatial).
It is possible to change the model name in Windows Explorer or in the Project Manager. The latter can be accessed via the menu "File" → "Project Manager" or the corresponding button.
Then, select the model and select the menu "Model" → "Properties". In the "Model Properties" dialog box, you can change the name.