We're encountering a couple of issues with zen mode on our platform that I could reproduce with community.nodebb.org as well:
Since latest Chrome update (Version 71.0.3578.98 (Official Build) (64-bit) and above)
Zen mode button doesn't work anymore.
It's working with Edge, Safari and Firefox though.
Can you fix it or does Chromium/Chrome need to do it?
When zen mode is activated then:
clicking emoji button doesn't produce anything
it's not possible to submit a topic or a post in zen mode