How to hide app icons on your Apple Watch — Apple World Today

Even though you’ve removed their Watch interfaces, the apps will remain installed on your iPhone unless you delete them from that device, as well.

You can also rearrange apps on the Watch’s screen. You can do it directly from the smartwatch by pressing and holding an app’s icon, then moving it to anew spot. Or you can go to My Watch on the iPhone, then to App Layout. There you can arrange your apps as you wish.

(This how-to is based on my experiences and info on Apple’s support pages — where the images sometimes come from.)