Question How to properly disconnect multiple displays?

[modeonoff]

Hello, I connected three displays to my PC running Windows 10. At first I just disconnected two displays by unplugging the cables. However, under Settings >> Display, I still saw the two displays icons labelled 1 and 3. They just became smaller boxes and dimmed. I don't remember what I did. I think I connected back, reboot and tried to remove them from Nvidia control panel and also disconnected them from Setting's Display. I tried various things. At the end, I have the main display (labelled 2) in a big blue box icon. The two boxes for 1 and 3 became dimmed and small boxes.

My first question is why Windows calls the only connected display connected to the PC 2 rather than 1?
Second question is how I rename it as 1?
Third question is do I need to worry about Windows remembering the displays? I am returning the three displays. Better to do whatever I need before returning them.
Finally, what is the proper way to remove a display? Sounds like I did not do it properly.

Thank you

 

[Lutfij]

Out of curiosity, what version of Windows 10 are you working with? You might want to follow this guide in order to set your primary display. Did you have monitors to the right and left of your main monitor?

Ideally you power off the panel, you want to remove, then disconnect the panel from the wall outlet, then disconnect the display cable from the system.

 

[modeonoff]

I have Windows 10 Professional 64-bit. Yesterday, I had the main monitor in the middle via the Display Settings under Windows.