You can change many home screen settings, such as the watch face.
Slide your finger left starting from the right side of the screen to select a new watch face.
Slide your finger right starting from the left side of the screen to go back to the original watch face.
Hard press the watch face.
Turn the Digital Crown to change between the different designs.
Slide your finger left starting from the right side of the screen to see more customisation options.
Press the Digital Crown twice to return to the home screen.