EM5 photo review settings

Why is it that when I review my photos on the back screen and zoom in using the rear dial, I can only zoom back out by using the wheel again. My other cameras that I have can revert back to normal view by pressing the centre OK button.
Am I missing something here or is that just how it is? I have spent a long time in the menu trying to find a fix but just get frustrated.
Any suggestions would be much appreciated.

 

Thanks Dirk, I will give that a try later. I'm at work now.

 

This works OK but why not just use the OK button like all the rest?