The side button of your Apple Watch has many different functionalities. Some of these functionalities include viewing your recent apps, quickly using Apple Pay or powering off your watch.
1.
From any watch screen, quickly double-press the Side button to open your most recent app.
2.
Press the Side button to view all recent apps.
3.
Press the Side button again to close the Recent Apps screen.
4.
You've completed the steps!
