Sorry if this has been asked and answered. I did a search but came up empty.
use this condiction:
WebDriver chrome1 = new ChromeDriver();
WebDriver chrome2 = new ChromeDriver();
chrome1.manage().window().maximize();//display 1
chrome2.manage().window().setPosition(new Point(2000,0));//display 2
Thread.sleep(1000);// 1 sec
chrome2.manage().window().maximize();//maximize display 2