How to change monitor 1 for monitor 2

Thanks. Perfect answer.

Prior to Windows 10 there was an option to change PRIMARY DISPLAYS... now it is gone again with this version!  FIX THIS NAOW!

Actually, i'm on windows 7, it's a problem which has never been resolved.  Even if you make a monitor your main monitor, my extended display is still my primary monitor, it just doesn't have the taskbar and apps on it.

Hmm. Thats really odd. I just tried it myself. Worked flawlessly. This must be something specific to docking stations. The OP mentioned a dock correct? And I saw others mentioning docks. I know it works on a regular desktop. I've done it on many different ones and various video cards. It's possible that it's something to do with how windows recognizes ports from the video card that is on board on the laptop versus how it sees the ports which are part of the docking station. Ultimately the graphics are derived off the on board video card from the laptop but I imagine there is something inconsistent with how the ports are recognized on the dock versus the laptop.

That is really strange. I've done this so many times with various versions of Windows and on multiple pieces of hardware over the years. But I cant remember if any specifically had a dock station involved.

The only thing you should have to do to quickly fix any of these issues with windows identifying monitors with a certain id or number is simply swap the cables on the back of your pc, laptop, or docking station (whichever you are using). That is the easiest way to change how windows sees which monitor has which monitor id or number. 

Just go on the back of your docking station, usb hub, or desktop and switch the cables. Let's say you have monitor "1" (which is physically on the right side of the desk) plugged into hdmi port 2 on the dock or video card and you have monitor "2" (which is physically on the left side of the desk) plugged into hdmi port 1 on the video card. Just switch monitor "1" so it's plugged into hdmi port 1 instead of hdmi 2 and then plug monitor "2" into hdmi port 2 instead of hdmi 1. Or maybe it's DVI or display port or any combination of these. It really doesn't matter. The point is you just need to switch around which ports each monitor is physically attached to on the video card or dock in order for windows to label and identify them differently.