https://wccftech.com/watchos-5-lets-you-edit-the-control-center-toggle-switches/

Apple Watch users will be pleased to learn that they can now edit the position of Control Center toggles in watchOS 5.

The inclusion of Control Center on the Apple Watch is wonderful without a doubt. But watchOS 5 takes the idea a bit further with the inclusion of a new ‘Edit’ button. Once you swipe up to bring the Control Center into view, just scroll all the way down and you’ll see a new ‘Edit’ button. Tap on it and you have the liberty of moving toggles around to the position where you like them to be. Handy dandy.