Frequently used features become reachable without opening Settings
Arranging frequently used features like Wi-Fi, the flashlight, and screen rotation in a preferred order means the Settings app never needs to be opened just to turn something on or off -- a single swipe down handles it instead.
Most tiles also open their full settings with a long press
A quick tap on a Quick Settings tile toggles that feature on or off immediately, but pressing and holding the same tile usually opens its full settings screen instead -- useful for something like Wi-Fi, where a long press jumps straight to the list of available networks rather than just switching Wi-Fi on.
Frequently Asked Questions
Does the editing process look different depending on the phone brand?
The basic idea is the same everywhere, but on some manufacturers' versions of Android, the edit icon sits inside a three-dot menu instead of appearing as a pencil icon, so checking there helps if it is not visible right away.
Can it be reset back to the original layout?
If the edit screen's menu includes a "Reset to default" option, tapping it restores the original tile arrangement.