can't turn remote screen black

Hi,

I followed this:

https://community.teamviewer.com/t5/Knowledge-Base/How-to-turn-the-remote-screen-black/ta-p/50966
but I can't turn the remote screen black.

1) On the client the "Show black screen" option is deactivated (not clickable):

Screenshot 2020-02-02 at 20.31.39.png
2) On the server I can't find "Install monitor driver"
I follow "Extras --> Options --> Advanced --> Show advanced options --> Advanced network settings --> Install monitor driver --> click Install... "
but in the "Advanced" tab I'm not able to find "Show advanced options" and in the section

"Advanced network settings" the option "Install monitor driver" is missing:
Screenshot_20200202_205017.png

On the server I have TeamViewer 15.2.2756 on openSUSE Leap version15.1.
On the client I have TeamViewer 15.1.3937 on macOs Mojave version 10.14.6.

How can I turn the remote screen black?

 

 

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