The Menu Builder could/should be improved
The actual Content Item selector should be the first thing/input field on the form. Else, guaranteed you'll click on the first one 'Label' / "Please enter a label", but you can't! as soon as you try to input something it triggers a validation message, then to the second input field required 'Item Content', which you would provide for a CONTENT item for example, but only to be overwritten after you actually SELECT the Content Item, so it is kind of unfriendly?
Another thing, The Preview button seems to be disable all the time, and the No Preview available message doesn't update when I actually can create a preview of my menu