For emotions categories that you have unlocked, you can now chose which ones that you wish to show / hide on the slider. This alllows you to manage the number of them so that you can easily access your favorite ones at any time!
To do this, from the Emotions Store simply view one of the emotions categories you have previously unlocked. You will see an eye icon in the top right hand corner of the page. Tapping this icon will hide them from the slider view, the icon will now show a cross through it. To un-hide them, simply tap the eye icon again.