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I am following this thread on how to open a Virtual box with two (virtual) monitors (=two windows, each correspondig to a monitor), so that I can display them on two physical monitors.

I am running Ubuntu on Virtualbox, on Windows 10.

I have my 2 physical monitors up and running (Windows settings: Display > multiple displays > extend these displays), I have my VM shut down.

Following step 4, I go to Virtualbox > My VM > settings > screen > number of monitors, but this parameter is locked, I cannot slide the bar.

Why is it locked? How can I unlock it?

Tms91
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    Instruction 1 is what people often miss… shut it down, don't 'pause' it. – Tetsujin Jul 01 '21 at 09:17
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    Thanks, if you want you can type it as as answer and I will flag it as correct. – Tms91 Jul 02 '21 at 08:32
  • Welcome - no worries, your answer looks good to me. Remember to mark it as 'accepted' once the timer on it runs down [I don't think it will let you do it straight away] – Tetsujin Jul 02 '21 at 08:39

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SOLVED

I was actually misinterpreting step 1:

I was shutting down my VM from Virtual Box

right click on the VM > shut down > save state

while I had to power off the VM from the VM window:

Ubuntu OS interface bar > power off/logout > power off...

enter image description here

Then, after my VM had rebooted, I had to go to

VM window > window upper bar > View

and here I can see two options: virtual display 1, virtual display 2.

Here I had to select

virtual display 2 > Enable

and another window opens, with a second screen.

Tms91
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