Studio Designer
The Studio Designer is basically the design tool for designing templates. Opening the Studio Designer from this menu item opens a blank spreadsheet to start building the template layout from. When you open the design of a template from Templates menu item, you get the same template area, and in addition you get some mandatory parameters as well as the Properties pane.
To start design from a blank spreadsheet, open the Studio Designer from the System Administration > Templates > Studio Designer link.
The ribbon and design user interface is the same as in Templates, and is described in detail there.
Additional information
This function can be useful when you want to import an Excel sheet and use as a base for designing a new template. The advantage over importing to an open Template is that here you get all Excel sheets when importing.
Import the Excel here, and then Save As Template from the File menu.