How do I open and clear recently used apps?

Click 'Active' to look at your recently used apps illustration
1.
Click 'Active' to look at your recently used apps
Open any of your recently used apps illustration
2.
Open any of your recently used apps
Swipe left or right to clear an app, or down to clear all apps illustration
3.
Swipe left or right to clear an app, or down to clear all apps