A single USB-C cable comes off of the dock. The dock has thunderbolt, HDMI, and VGA on the back. A word of warning, though: be sure to check out Sierra’s system requirements before you hit the download button, as they are more taxing than what has gone before. I have a 2017 MacBook pro w/ touchbar and the Dell WD 15 dock (work issued it to me). However, as Sierra continues tradition by leaping from the App Store onto your machine for the princely sum of nothing – just like every version of macOS has been since OS X 10.9 Mavericks.
The 10.12.5 drivers work on the 2016 MBP, but not the 2017 MBP (even if both are running Mac OSX 10.12.5). In the meantime, the second beta of macOS 10.12.6 was recently seeded to beta testers, making it perhaps one of the last updates we’ll get before version 10.13 shows up I downgraded to Sierra and used automate GPU script to get the card working.
MacOS 10.13 High Sierra enforces the same system requirements as macOS 10.12 Sierra before it, so there’s no excuse for not installing it. MacOS High Sierra brings with it more comprehensive editing options in Photos, official external graphics card support, as well as the Metal 2 graphics tools and even VR support for developers. That’s right, on June 5, Apple revealed macOS 10.13 High Sierra. It will only show up when you drag your mouse pointer onto the bottom of the screen. Check the Automatically hide and show the dock here and your dock will be hidden. In order to disable your dock from appearing on the main screen, click on system preferences followed by Dock.
As of Apple’s annually held Worldwide Developers Conference (WWDC 2017), macOS Sierra is no longer the new kid in town. How to Enable or Disable Dock on Your MacBook.