I tried creating a decision zone on the conveyor in the factory flow simulation app but couldn't see it. wheras i was able to successfully create the resource zones near the conveyor and see them. Could you please let me know why this is happening.

I have attached a picture that shows that the resource zone has been created but the decision zone hasn't. i tried changing the preferences for the factory Flow Simulation application but i didn't observe any change. could you tell me a way to make it look visible.

Edu ​​​​​​​DELMIA ​​​​​​​