Hmm, I'm not familiar with that "hide" setting in SuperSU
@James L...I do see the "Show notifications" checkbox to enable/disable the toast messages, but not a feature/option to have the app hide itself (i.e., from/in the app drawer, etc.)?
Also,
@dicavo, it looks like the Xperia Z3 might not necessarily have an easy / simple root process:
(I've no experience with this device or the process, so I can't really offer any direct experience)
There are a couple of other ideas for hiding or obfuscating root (none of which are simple/casual) none of which would fool a determined, knowledgeable user, but the custom launcher options discussed above is probably your best bet.