Change default visibility of ideas submitted via Slack

I recently installed the Slack integration. When one of our team members submits an idea via Slack, it shows up in our Aha dashboard but not on the associated portal page. As of right now, I believe I'd have to change the visibility of each new idea after the fact so that it shows up in the portal. I'd like there to be an option for me to change the default visibility of all ideas submitted through Slack so that they show up in the associated portal by default.