How to change Slack channel used for notifications?

I have a small problem. I want to change the main slack channel used in Slack integration. Any idea where I can do it? Our first choice was unfortunate and know when the slack feature got more popular the main channel is spamed with wrong content :frowning: Any way of changing the channel without deleting and reinstalling metabase slack app will be much appreciated :slight_smile:

The slack channel is defined on each alert/subscription. There's not a "default" channel