The functionality of assignments made from the desktop dashboard being visible on mobile is an example of:

The functionality where assignments made from the desktop dashboard are visible on mobile exemplifies cross-platform integration. This term refers to the ability of different computing platforms, such as desktop and mobile devices, to work together seamlessly. By allowing users to assign tasks on one device and view those assignments on another, Hootsuite demonstrates how its interface operates cohesively across different platforms, ensuring that users have consistent access to their team’s assignments regardless of the device they are using.

While other options highlight important aspects, they don’t specifically capture the essence of this functionality. Real-time updates pertain more to instantaneous changes and notifications rather than the ability to share and view assignments across devices. Team collaboration encompasses working together and communicating effectively, but it doesn't directly address the integration across platforms. Data synchronization focuses on ensuring that data remains consistent across devices and locations, but without the specific emphasis on the interaction between different platforms, it doesn't fully encapsulate the example given.