Dialog boxes on an RDS are hidden in a non-existent 2nd monitor

Hello Experts

We have a Remote Desktop 2016 and have issues with - some - dialog boxes

Example:
* On a single monitor terminal ,
* print a PDF from Adobe Acrobat and
* try to change the printer properties (for example to change the paper size).
* The dialog windows does not seem to appear and Adobe stops responding.
* Go to a computer with 2 monitors to reconnect to the RDS session and the dialog is shown on the 2nd screen
* Conclusion: the dialog box was always there, but wasn't visible on a single monitor terminal. It is as if the dialog box popped up on a 2nd (non present) monitor
* This happened with 2 different users, using 2 different applications
* It seems to be specific to pop up windows

Pressing <Alt><Tab> or <Windows><Left> repeatedly (to move the dialog box around) does not fix the issue

Any suggestions on how we can prevent from this happening in the future???
LVL 4
Alexandre MichelManager; IT ConsultantAsked:
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McKnifeCommented:
I am pretty astounded that using alt-tab to select the ghost windows and then afterwards using winkey+left/right does not show the window - it should. Pressed left/right repeatedly?
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Alexandre MichelManager; IT ConsultantAuthor Commented:
Hi

I made some progress: <Win><Left> does not move the dialog box, but <Shift><Win><Left> does as being a dialog box, it does not want to resize...

Alexandre
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Alexandre MichelManager; IT ConsultantAuthor Commented:
The proposed solution wasn't working
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vkroslidCommented:
Does it help to right-click task bar and do "cascade windows"?
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Alexandre MichelManager; IT ConsultantAuthor Commented:
@vkroslid  I don't think that "Cascade Windows" has been working for quite a while ... ?
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