If you turn zen mode on in your preferences, the zen mode toggle button that appears in games should always remain, even when you've used it to toggle zen mode off. You could then use it to toggle it back on. To remove the zen mode toggle button you would disable zen mode in your preferences.
I always play in zen mode, except for in some cases such as when a friend challenges me and I want to toggle it off so I can see the chat. It's easy to toggle it off because of the button that is on screen in games, but then to put it back on I have to leave a game page to go back in to my preferences and enable it.
It doesn't make sense to me that there is a button to toggle zen mode off outside of preferences but not one to toggle it back on.
I always play in zen mode, except for in some cases such as when a friend challenges me and I want to toggle it off so I can see the chat. It's easy to toggle it off because of the button that is on screen in games, but then to put it back on I have to leave a game page to go back in to my preferences and enable it.
It doesn't make sense to me that there is a button to toggle zen mode off outside of preferences but not one to toggle it back on.