How to Fix Notification Volume Too Loud on iPhone [easy]

The simplest way to fix your iPhone's notification volume being too loud is to adjust the dedicated slider in Settings, as the media volume and the ringer/alerts volume are controlled separately. To do this, go to Settings, tap Sounds & Haptics (or just Sounds), and then drag the slider under Ringer and Alerts to your preferred volume level, which immediately previews the sound as you adjust it; for an easy way to prevent accidentally changing this alert volume when you use your side volume buttons for music or videos, you should also toggle the Change with Buttons setting to the Off position on the same screen.