The navigation drop down lines up on the left-hand side of its parent navigation item – in this case the “Lectures” navigation item. Currently there isn’t a toggle to change which side the drop down lines up on. This is on the roadmap though. Until then you can place another navigation item that doesn’t have a drop down after the “Lectures” page to offset that drop down a bit, or you can use an Inner Max-Width setting for your Navigation bar, which could help your layout a bit.