Delete an item in a repeated group when editing submitted data

Thank you @Kal_Lam , it is very clear and helpful. However, in my case I don’t see the (-) button:

Continuing the investigation, I think that the issue occurs when the repeated group item’s repetitions are determined by another question (through the repeat_count). Indeed, I tried another survey without this property and it works exactly as you describe.

How can I resolve in this case?

Thanks,