Samsung J7 issues with update

[Sheryl]

With great reluctance I allowed installation of the latest update onto my Samsung J7.. (In my experience updates always make things worse, but if one doesn't update eventually it becomes impossible to install new apps as the app makers ate in league with the Andriod OS folk. Ok rant over.)

 

Hate the changes but can live with most. What is stumping me is I can no longer find a way to close individual applications. Used to be that pressing the left side window button gave me each app in a window that could be closed. Now it gives the windows but no way to close except to select "close all".  So I either have to keep accumulating open apps and drain the battery/use up memory, or keep closing and reopening an app that  I am using.

 

Is there a way to do this that I just haven' tfound?