Thank you sebastian. It's not working. my tester have been tested this , but under High Sierra, this option is not available for app only. Here is a answer of my tester :
"This is not available for the application only (this option is not present in the right click menu / Ctrl click nor in the parameter space available from this space), but available only on the whole system, in the settings of the OS. And the problem is the same, because here the problem is not retina (as on a Mac Book) but the screen resolution in 5K retina is not here really the problem."
I see answer of Simon
. Ok , i wait a new update for fix that, thank you both sebastien and Simons.
PS : Do you have an idea when the update will be available?