Hi Mick,

Thanks. I found out that unchecking Displays have separate Spaces was indeed 
the problem.
Yes I know XQuartz is dead and xorg-server at low support. Some day I will have 
to move to Linux for good… 

Regards,
Laurent

> Le 28 janv. 2021 à 16:39, Michael Mueck <mick.mu...@mac.com> a écrit :
> 
> G'day Laurent,
> 
> I use 2 external monitors on my MacBook Pro and an external keyboard - 
> although I never close my laptop i.e. I effectively have 3 screens. For that 
> to work properly I believe you have to uncheck "Displays have separate 
> Spaces" in the Mission Control system preferences. As an aside, I don't use 
> XQuartz (which I believe is totally abandoned) so I've switched to MacPorts 
> xorg-server (which isn't abandoned, but effectively on or below minimum life 
> support). The are many bugs, you'll just have to live with them or move to 
> another platform...
> 
> Regards,
> 
> Mick
> 
> 
>> On 2021.0125, at 9:21, pagani laurent via X11-users 
>> <x11-users@lists.apple.com> wrote:
>> 
>> Hi,
>> 
>> I am running Sierra on an MBP and I have the following problem:
>> 
>> Running XQuartz on my MBP works fine, if I use an external monitor and an 
>> external keyboard with the MBP close, it also works fine but if I try to use 
>> both monitors side by side, XQuartz disappears. I can still see its various 
>> windows when I activate Mission Control, but no window when I ask to see the 
>> app windows.
>> I do not have this problem with Terminal but the graphic windows in Terminal 
>> that are in fact XQuartz items, though they appear, take ages to refresh (30 
>> sec. typically before a drawing order is displayed on the window!).
>> 
>> Has anyone a hint about what to do to prevent these problems ? I am a heavy 
>> X11 user and I find it stupid to not be able to use both screens (and not 
>> even the big terminal alone if I have no external keyboard).
>> 
>> In the Mission Control panel, there is the possibility to have separate 
>> Spaces (desktops ?) for separate screens. It is presently activated. Could 
>> it be the reason for the problem ? It seems that I need to restart my 
>> computer to test that… therefore I’d rather ask before going into that 
>> trouble.
>> 
>> Thanks,
>> Laurent
>> 
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"S'il n'y a pas de solution, c'est qu'il n'y a pas de problème" (devise Shadok)

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