Not sure if this is what you are referring to:
On phone dashboard, when use left and right arrows beside big circle at top to display day before or after, that changes only the data above the horizontal line; i.e. steps, floors, miles, cals, active minutes. For the fields below the horizontal line, the only way to see different days is to tap the tile and look at the individual metric.
However, there is a new dashboard app version currently being rolled out which might change this.
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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