How do you change your app drawer into alphabetical order on Andriod Lollipop

[AC Question]

Basically I had my phone drawer in alphabetical order and I left my phone on after letting my friend use my flash light and it changed and I don't know how people say there should be an A-Z option but I don't see it I feel like I have a different phone type please help someone

 

[B. Diddy]

Welcome to Android Central! Which phone? Are you using its stock launcher, or did you install a 3rd party launcher like Nova?