We totally understand why you’d want this, sometimes you build a layout and later realise it needs to be bigger or smaller.
However, we currently do not offer an option to scale or resize the entire project at once.
What you can do instead:
If you need to change the size of your plan, here are the best alternatives:
Adjust walls and room sizes manually (most accurate)
Switch to 2D view.
Select a wall and adjust its length.
Repeat for other walls until the room/building matches the correct size.
This is the best way to keep your layout accurate.
Rebuild the layout using the correct dimensions
If the size difference is significant, rebuilding may be faster and cleaner, especially if you have exact measurements.
Tip: Before making big changes, consider creating a copy of your project so you can always go back to the original layout if needed.