It also gives you the flexibility to plug in your laptop directly to the monitor, and can serve as an upstream port to connect other ... connected to the monitor via USB-C. The best part, however ...
Most portable monitors offer the option to connect over USB, a video input (usually HDMI), or both, but the number of ports available ... test each monitor using a Datacolor Spyder X2 Ultra ...
Although the dock seemingly only has a single HDMI output, you can use one of the downstream Thunderbolt 4 ports to connect another monitor either directly through USB-C, or via an adapter.