What is the button that appears on the first minimized app when you tap the Recent Apps button?

[AC Question]

So if you have multiple apps open and you tap recent apps, the screen will minimize the first app with the subsequent apps indexed behind it. In the top right of the first app theres a greed out button that looks like a 'minimize' button with two arrow. What is the purpose of this button. I only ask since it logs me out of certain apps when I hit that button instead of just maximizing the app to full screen.

 

[B. Diddy]

Welcome to Android Central! Which phone? I don't see that on my Nexus 6P running 7.1.2.

Can you show a screenshot? http://forums.androidcentral.com/ge...ide-how-post-screenshots-android-central.html. You'll have to register on this forum first.