It doesn't work like that.

** Edit: **I used blue not green in my example |

See

Merging, subtracting, or intersecting shapes in the Draw Guide where you create a blue shape, create a red shape and create an "intersection of both" shape which you colour yellow.

*Three shapes: blue, red and yellow.*

Note the yellow shape has been selected.
- Clipboard03.png (10.47 KiB) Viewed 225 times

1 Create both shapes

2 Create intersection shape

3 Set intersection shape to yellow

4 Copy intersection shape

5 Undo till you get the two original shapes

6 Paste the yellow intersection shape. It appears in front in

exactly the correct position.

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