Currently, the "Remove all other discounts when this code is applied" option is only available for Discount Codes, not for Optional Discounts or Automatic Discounts. I would be great if it could be applied to optional and automatic discounts as well.
Thanks!
[Another topic was closed as a duplicate of this topic ('Remove all other discounts" check box for optional discount)]
Thanks for this request, Liz! Feel free to share it with likeminded users who would be willing to give it an upvote.