How can I remove the new back-to-previous-app iOS 9 button from my app?

For example, when a user logs in to my app with Facebook, I open the Facebook app for auth, and then the Facebook app switches back to my app. But from then on, "Back to Facebook" stays in the top-left.

How do I change the app switcher on my iPhone?

Swipe up from the bottom to the middle of your screen and hold until you see the App Switcher. Swipe left or right to find the app that you want to use.

How do I remove apps from the app switcher?

You likely already know how to close one app in the app switcher: swipe up on its card until it disappears.

How do I revert to an older version of an app iOS?

In Time machine, navigate to [User] > Music > iTunes > Mobile Applications. Select and restore the app. Drag and drop the older version from your backup into your iTunes My Apps section. “Replace” to revert back to the older (working) version.

At this time, I do it by hiding status bar. I am still looking for a better solution.