I wish to connect two Mac machines to my UltraSharp U2723QE using USB. So far, I have connected both the machines to my monitor using USB-C =

1. Mac Mini through the USB-C port at the center

2. MacBook Pro through the USB-C port on the left side

I would like to-

1. Easily switch between the two machines using a shortcut key.

2. If possible, use my keyboard and mouse connected to Mac Mini to control both the machines. 

Is this possible? Please let me know how.