Auto Stream Type?

[Jomsha]

Hi
I know Hikvision have "Auto" function to display 9 screen split as sub-stream.
And when full-screenits Main-Stream.
And back to sub-stream.

In Dahua I cant find function like that...
I have NVR4208-8P-4KS2
And I can make channel sub-stream..
But after full-screen, im back to 9 split screen
The stream type still on Main-Stream...

If anyone can help it will be appreciated

Thanks in advanced

 

[Jomsha]

Someone?