You can't install two computers on one MacBook at the same time. You must use one. Be careful not to move your computer with it or it may shut down. The connection comes off quite easily. There will be no redemption. Only lasted a few months. Suggest looking elsewhere for a more durable one.
USB to USB Type-C adapter
18 Review
4K / 30Hz USB-C to HDMI Adapter - 3-in-1 Type-C Converter Cable for MacBook Pro, MacBook, Mac Pro, iMac, Chromebook, and USB 3.0 Type-C Devices (2017/2018)
13 Review
Ultimate Compatibility: USB C to HDMI Adapter for MacBook, iPad, Dell, Surface & More
12 Review
Tobenone USB C to USB Adapter with π» 2 Ports for MacBook, Dell XPS & More Type-C Devices
13 Review