Hi Laurent,

> what i mean is when i navigate i can't go back to an
> horizontal view (manually).

Yeah, that's normal for how the "Free rotation" method works - when you are in free rotation mode every rotation to the left, right, up, or down uses the directions local to your current view direction, it does not do any special restriction to lock things to a world-axis horizontal view.

The other "Rotate around world z axis" mode is normally what you should use if you want to keep the cplane horizontal as you rotate around.

But there are a couple of ways you can get back to a horizontal view while you are in free rotation mode, see that link I posted above for a couple of different options, if you want you can set up a script that is shown in that post on a shortcut key.

- Michael