When connecting your dock, you may want to have a preferred main screen to get started on your work flow.

Here's how to make your setup seamless!

Step 1: Go to the top left corner to select the "Apple Logo" > Select "System Settings"

Step 2: You'll be brought to the "System's Setting" page > Select " Displays" > " Arrange.." 

Step 3: There is a white bar that is on the top display monitor. You will select this, holding and dragging to the screen you prefer to be your main screen. 

Completed: Now when docking, your Mac will remember the last orientation from the last connection!