I have a brand new Samsung Galaxy S6 (running Android 6.0.1). As an account manager, I receive a lot of calls during a day, which can be quite stressful, as I'm usually in meetings.
When the meetings are over, I have 5+ missed calls, showed by the red badge in the right corner of the "Phone" app button.
Since I don't have the time to call everyone back, I usually focus on the ones leaving voicemails.
I would really, really, REALLY love the badge to stop showing, but haven't found a way to disable it yet. I've searched the internet a lot of times, seen a lot of videos on youtube and so forth - but to no avail.
Therefore dear reader: Can you help me? I would really appreciate it.
You can't stop it. There's no inbuilt function to customize it. You'll have to download and install a launcher that does have more customization features. Personally the second thing I install on any device I own/setup is Nova Launcher (first is Swiftkey).