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Accidentally find Different One Handed Setting

I was doing putting away my phone goofily and accidentally activated a one-handed type of operation, but instead of reducing my whole screen or just keyboard, it reduced my active app (Google Hangouts) to a smaller size, but I could still see the home screen and manipulate apps behind it.

There was a blue circle at the top of the smaller screen and I could move it to anywhere with in the screen, not just to a one righthand-side of the lefthand-side position, as with the Samsung standard one handed operation.

I went to the Samsung display settings and there is a one-handed operation setting there but it is not like the one described above.

I found online is the shortcut temporary method to activate the one-handed operation is to swipe in from the edge of the screen with your thumb to the center of the phone and then back to the edge, but I tried about 20 times with and without my phone cover and that gesture activated nothing from my phone.

1) How did I get to this one-handed operation described above?

2) Why might my swipe from edge-center-edge gesture doing nothing?

Thank you!
 
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