Hi @Grs38 ,
you should be able to close only an app by following these steps:
To close: Scroll through the list of apps, touch and hold the app then swipe the screen up or down. You can also tap Close all (bottom-center) to close all open apps at once.
Thanks TessM, works a treat.
Flicking an app up or down to remove it didn't work when I first got the tablet, so but no problems now.
Thanks for your prompt response.