On an iPhone 7 device, you can access and adjust camera settings by following these steps:
From the home screen, find and tap the Settings icon, which looks like a gray gear.
In the settings menu, scroll down until you find the "Photos & Camera" option and tap it.
In the "Photos and Camera" page, you can find a variety of camera setting options, such as grid line display, location services, etc. By turning these options on or off, you can tailor the camera's functionality to your needs.