Android 5.1.1 - disable auto rotate for home screen but NOT for apps (Xperia Z3)

[AC Question]

I have an Xperia Z3 running Android 5.1.1 and when I was poking about in the settings, I selected an option that allowed the home screen to auto-rotate as well as applications. Now I can't find the option again! Before I get people telling me to turn off auto-rotate in accessibility, this is a SEPARATE setting and I cannot remember where to find it! Thanks in advance, Kitchen10