All day sync is now always on.
From How do Fitbit devices sync their data?
Why was the all-day sync option removed from the Fitbit app?
To improve your experience with notifications, syncing, and firmware updates, we removed the option to turn off all-day sync from the Fitbit app. When your phone is near your Fitbit device with Bluetooth turned on, it periodically syncs with the Fitbit app to update your stats and download available firmware updates. More frequent syncing rarely, if ever, noticeably decreases your device’s battery life. To learn more about what factors affect battery life, see Can I extend my Fitbit device's battery life?
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