The basic contents of the Home button for a Role Center are defined in the Action Designer in ActionContainer of SubType as HomeItems:

In addition to the action controls defined in the Action Designer, the Navigation Pane Home menu list includes all the Cue entries that appear in the Activities Pane of the Role Center. We can see the combined sets of action options in the following screenshot. Note that there are a number of indented (nested) options within groups such as Sales Orders, Sales Quotes, and Sales Credit Memos. These groups are set up using the same type of Configuration tools that we just used for the ribbon:

We can access the Configuration/Personalization tools either through the arrow next to the drop-down arrowhead to the left of the ribbon (as shown earlier) or through the very tiny icon at the bottom right of the Navigation Pane (highlighted by an arrow in the preceding screenshot).