Don't know about FP3 specifically, but on some phones it's built-in in accessibility settings (all Samsung phones for example). For other phones you can try an app such as Button Mapper and assign "accept call" to a button.
25 karma · joined October 16, 2017
Here's an interesting blog post that explains how our new phones can now take pretty good night sky photos: https://ai.googleblog.com/2017/04/experimental-nighttime-pho...
You can obviously disable all notifications of an app in Android itself but it cripples an app if some of those notifications are actually useful.