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Issue with MSFS pop-up window after SU12

After Sim Update 12 of MSFS2020 some users experience problems with pop-up windows. Please read below to understand what is the problem and how to fix it.

In most cases users can see magnifying glass icon when they hover coursor over FMC/MCDU and hold RIGHT ALT + LEFT MOUSE BUTTON, but after clicking it nothing happens.

SimBox uses that feature to display FMC and MCDU on the tablet/phone/browser.


In SU12, Asobo changed the way how pop-up windows are handled. From now on - position of the pop-up window is saved in sim memory. This means that if you move the pop-up window to the second monitor, it will stay there after restart of MSFS. This is especially useful for people who use multiple monitors and have home cockpit setup.


SimBox creates "virtual display" that is captured and used to display FMC and MCDU. After SimBox is closed - new "virtual display" is also destroyed.

In the scenario, when you close your MSFS and then close SimBox - the position of the pop-up window is saved in MSFS memory. When you start MSFS again, it will try to open the pop-up window on the same position. But since SimBox is not running, the "virtual display" is not available and MSFS will not be able to open the pop-up window.

Unfortunately this new feature of MSFS is not yet smart enough to detect that the "virtual display" is not available and it will try to open the pop-up window on the same position instead of bringing it back to the main monitor.

Current solution

Helps sometimes

To fix this issue, you can either:

  • Start SimBox before you start MSFS and enable "virtual display" option in SimBox FMC/MCDU screen before you open the pop-up window in MSFS
  • Enable SimBox and close it. So when your "virtual display" is online, and you close SimBox - "virtual display" will be destroyed and MSFS pop-up window will be taken back to the main monitor.

Helps most of the time

You can use great tool available on called MSFS Pop Out Panel Manager.

It allows you to save and restore window positions and sizes. It'll also help you to resize windows precisely.

SimBox does not have such feature yet.

Long term solution

I'll report to Asobo about this issue and hopefully they will fix it in the future. Desired behavior would be to detect that the "virtual display" is not available and bring the pop-up window back to the main monitor instead of trying to open it on the same position on non-existing "virtual display".


Please remember that you can always preview how "virtual display" looks like in your "Settings" tab. This might be useful to check if your "virtual display" is working correctly and whats the content of it.