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Check out this help file for reassigning buttons: https://help.fitbit.com/articles/en_US/Help_article/2086/
Basically the bottom right button opens the app located in the bottom left of the first app screen. You can rearrange the position of apps by touching and holding an app and then dragging it to a new position
I finally figured this out. On the watch face, swipe left from the Clock to see the Apps. Move the Exercise icon (yellow running guy) to the first spot in the upper left corner. I did that by pressing long enough to see it was now ready to be dragged to a new spot. Before I did that, the Music app was assigned to the upper right button. After I did that, Exercise is now assigned there. So I don't have it on the lower right corner button but I do have it on the upper left corner button. Not sure if you move it to where the Coach app is currently if that will keep it like it was before 2.0 but I just wanted it back as a button shortcut. Hope this helps!
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