The info appearing for closed OCs is missing from the translation key file en.yml:
"The order cycle you've selected has just closed. Please try again!"

I would like to tackle this issue.
hey @filipefurtad0, as admin I'm not able to close an OC while some customer has products on cart.
Hey @luchiago ,
What the exact difficulty you are encountering?
Deleting the OC should not be possible - indeed, the trash symbol disappears after there is an order. However, changing the date in Close into a past day should close the OC.
Hope this helps?
Yeah, it helps, that is exactly what I was looking for. Thanks