I have tested this on 1, 2 and 3 display systems over a month ago.  There 
appears to be a 1/2 hour delay (or so) before it takes over and is full screen. 
 Sorry, I can’t help more at the moment.  Greetings from the deepest darkest 
jungles of suburban Windhoek.

Alex Zavatone

Sent from my damn pain in the ass iPhone.

> On Aug 15, 2023, at 12:31, Gabriel Zachmann via Cocoa-dev 
> <cocoa-dev@lists.apple.com> wrote:
> 
> I have one user of my macOS app (under macOS 13.4.1) 
> where the app does not want to go into full-screen mode.
> 
> It is a pretty plain app.
> 
> In the AppDelegate's method -applicationWillFinishLaunching,
> I switch to full screen like this:
> 
>   [self.window toggleFullScreen: nil];  
> 
> It works, of course, all the time on my Mac; 
> also, as far as I know, there is only one user where it does not work.
> 
> After toggleFullScreen, I could check if the window is in full-screen, but I 
> don't see I would gain anything from that.
> The toggleFullScreen does not seem to provide any error value.
> 
> I have already googled, but it seems like what that user reports does not 
> happen anywhere else.
> 
> Is there anything that could prevent a window from going into fullscreen mode?
> 
> Best regards, Gabriel
> 
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