Windows Phone 8.1 offered some good amount of customization and also personalization of start menu. But there was no option to pin the settings to start menu and you could only pin the apps. But with Windows 10 Mobile, this option has been made available in the OS. So now you can pin any of your favorite setting to the start menu.
So in case you are using a particular setting quite frequently, then you can pin it to the start and access it quickly. To do this, open settings and press and hold any of the option and you get to see the option to pin to start.
You can pin any of the setting and this is not just limited to the first set or group. Each individual setting can be pinned to the start menu. The pinned item will also have the icon which is used in the setting.
Related Reading: How to Pin Settings & Folders to Windows 10 Start Menu
You can also make these tiles larger or smaller. If you want to unpin them, just press and hold the icon and hit the delete button at the top similar to how to do on any app.