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Yes, you can still move an app to SD:
/t5/Xperia-Z3/Apps-transfer/m-p/1116842#M30862
If this is not the question, see @YoGem's reply.
Edit: are you talking about unifying internal storage with SD card? If yes...
Rico2, this function is not enabled for your device. You can't use the SD card as internal storage, it's intentionally disabled to avoid lags and performance issues.
This feature is mainly intended for very low end devices.
Anyway, such feature pose risks: internal storage failure or phone failure - you won't be able to recover data from the SD card.
SD card failure (very common) you will have to factory reset the device and won't be able to recover the content of the internal storage.
See why it's disabled? 