The Settings app is where you can go to change, see, and manage nearly everything on your phone. There are multiple ways to open Settings—so you can choose which is best for you.
In Android 9 Pie:
- Long swipe up from the bottom of the phone—or swipe up twice—to open the App drawer
- Swipe down twice from the top of the screen to pull down the Notifications shade, then tap
- Use Google Assistant by saying, "OK Google. Open Settings."
In Android 8.0 Oreo, the Settings app is in the same place in App drawer and Notifications shade—but it only takes one swipe to get to it, instead of two.