Use the Close snap override for closing chained loops

Here is a little workflow tip for drawing closed loops:

1. Start making a Wall, Line or similar with the Chain option ticked in the Options bar.
2. Click to make lines until you reach the final segment...
3. Right-click, Snap Overrides - Close
4. Revit will magnetically choose the correct 'closing' point.
5. Left-click to close the loop.