I can use time in order to automate that. Turning off the wifi at the moment without any interaction.
But if I could do only disconnect wifi, it will be better.
I found something, but still far to be perfect.
I disabled auto connect to my Wifi network. So just have to turn off and on wifi and I disconnected from it. I can do that with automation so at a time when I'm usually far from the box.
But the problem is that I don't have something similar in order to connect to network box again ?