Drag-and-drop interaction with active drop zone that is not evaluated

Hello FrançoisMichot​,

Thanks for sharing your file with us! I was able to adjust this with a few quick changes in Storyline. 

1. Modify the Drop Target 

 You can make an object draggable even if it isn't part of the correct response (i.e., a decoy drag item). Just select that object in the Drag Item column, then select None in the Drop Target column.

2. Update Drag & Drop options

In the Drag & Drop Options window, remove the checkmarks for:

• Return item to start point if dropped outside
• Snap dropped items to drop target

I'll attach the updated .story project file for your reference. 

Let me know if you have any questions!