Swipw up and to the right, like you're making a half square and it will instantly open the multi-task, much quicker and easier than holding.
hmmm, I cant get this to work...
will see if I can find a video showing it!
Thanks dude!
EDIT: I get what you mean - like this : http://www.idownloadblog.com/2017/11/17/iphone-x-app-switcher-secret-gesture/
That opens the multitasking view - I don't like having to hold on an open app for a second in the multitasking view before you get the option to actually close it...