Some of the settings locations have recently been re-organized with most of what was in 'Advanced Settings' now under 'SETTINGS' on account page (tap profile pic from 'Today' page).
But for sleep sensitivity, first be aware, for trackers with heart rate tracking, that setting is ignored - that was just for trackers without heart rate sensors that had to judge sleep from movement.
But if you do still want it, I found it on the fitbit.com dashboard under 'Settings'.
Before posting, re-read to see if it would make sense to someone else not looking at your Fitbit or phone.
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