What feature allows components to be rearranged, including the Primary Tab, in a Salesforce console?

The feature that allows components to be rearranged, including the Primary Tab, in a Salesforce console is Multi-Monitor Components. This capability is designed to enhance the usability of the console by enabling users to manage multiple tabs and components across different monitors. When using multiple monitors, users can easily drag and reposition components like the Primary Tab, thereby customizing their workspace to fit their individual workflow and preferences. This flexibility is particularly beneficial in service scenarios where agents may require immediate access to various information sources simultaneously.

The other options do not directly relate to the functionality of rearranging components within the Salesforce console. Custom Dashboards are focused on data visualization and reporting rather than the structural layout of console components. User Interface Adjustments might imply changes to overall UI settings but do not address specific tab and component rearrangement. Tab Configuration typically refers to the setting up and management of tabs rather than the fluid rearranging offered by multi-monitor capabilities.