Each Persona's workspace can be customised to fit your individual way of working. A panel can be standalone or in a panel group; multiple panel groups make up a Studio.
If you want to save your favourite arrangement of Studio panels, tools, or icons on the Toolbar for later use you can save them to a preset. For example, you could undock and snap Colour and Swatches panels together for colour work, alter the arrangement of Toolbar icons or undock and increase your Layers panel's height for better layer control.
For future selection, the named preset you save will be shown in the same sub-menu as the above command.