Issues with iPhone trying to render desktop version

I’ve had a user report issues with my discourse install on their phone:

Out of the few people that have tested it for me (I don’t own an iPhone), he’s the only one with the issue, so it could be local to him, but I figured it was worth reporting anyway.

Click on the hamburguer menu, and then click on Mobile Version.

He probably have “Request Desktop Version” feature checked by mistake.