It used to work until a few months ago and then, suddenly, it stopped working. I use a European keyboard, which causes the Right-ALT key to be interpreted as CTRL+ALT but it worked even this way before. Anyway, I created an alternative language configuration in my Windows 10, using the US keyboard, just to try it. MSFS now recognizes it as Right-ALT (I tested it by assigning it to an action in Controls) but it still doesn’t work to pop-up displays. My mouse turns into a little hand while over the displays as if it was over a knob or switch, but pressing Right-ALT doesn’t make it turn into the magnifier.
Does anybody have any idea of what could have caused this and how to fix it?
Did you find a fix please?
I am trying to assign Right Alt - KEY to custom views but when scanning it returns Right Alt as Right Ctrl Right Alt. I use autohotkey with that key a lot - it has no problem with this. So I feel it’s not an OS thing but an Asobo thing - but I could be wrong.
Unfortunately not. I still have the problem and cannot pop up any display.
Yes, it seems to be an Asobo issue since I changed the language and the scanners were returning Right-Alt. Even the controls assignment was recognizing it, but not the display pop-up functionality. :
If you have multiple monitors open in the experimental setup, disable them and try again.
You can add the monitors once you have popped out the displays.
This was happening to me: right-alt did nothing (no magnifying glass icon when hovering over a cockpit display). I found that the KEYBOARD profile had somehow changed to one marked “short”. Changed it back to my correct profile and voila! Smiling again.
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Wonderful! It was not quite the same issue here, but you led me to the solution. Indeed, I also had another keyboard profile in use, but it was my own, which I created to customize some keys (AFAIK, we cannot customize the Default keyboard profile).
Following your lead, I switched back to the Default keyboard profile and the R-ALT key worked again. I searched for the use of the ALT key in this profile and found a configuration called “New UI Window Mode” under the Miscellaneous section that is assigned to the R-ALT key and which is the function that pops up the displays.
I went back to my profile and found that it was assigned to L-CTRL + R-CTRL. I don’t know how it changed to that assignment but I’m sure it was not me. This combination is impossible to reach with one hand and I’d need a third hand to click the mouse. 
Anyway, changing it back to R-ALT got it working again. Thanks for sharing!
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