How to edit application configuration settings? App.config best way to go?

Question

For my project I have settings that I added through the Settings in the project properties.

I quickly discovered that editing the app.config file directly seems to

Answer 1

EDIT: My mistake. I misunderstood the purpose of the original question.

ORIGINAL TEXT:

We often setup our settings directly in the app.config file, but usually this is for our custom settings.

Example app.config: