How to turn back on Slow Charging Notification?

Got my new Galaxy S8+ (and am loving it!) running Android 7.0 but I got a slow charging notification when I plugged it into my car and quickly hit the "Don't show this again" button without thinking. I realized afterwards that it's probably a good idea to know when the phone is slow charging.

How do I reverse what I did so the phone shows the pop-up notification when it's slow charging? I'm sure there's a place to clear it out in the settings somewhere but cannot find where it's buried for the life of me!

*Bump*

I am also looking for this.

When ever you charge the phone if you pull down the notifications shade it will either say fast charging or slow/cable charging.

Device Maintenance. Battery . 3 dots . Advanced settings.

Is fast charging enabled?
Did you limit notifications to only 3 most recent or all?