The help button stays when you turn on the assistant

The ? in the top right is there whether or not you use the assistant. It opens the same panel as always, with Help for the help centre, Changelog for what has shipped, and Messages for the requests you have sent us.

With the assistant turned on, that panel opens from the ? only. The assistant keeps the bottom right corner to itself, so the two no longer land on the same spot.

Before this, turning the assistant on took the ? away.