Currently when viewing metrics reports, when selecting Custom dates, the view by field will automatically switch to week if the date range you select is 14 days or more. This occurs even if you initially select View by to a value of "day".
select Date range as Custom
select view by to have a value of "day"
change the date range to cover at least 14 days
The view by field will automatically switch to "week"
NOTE: Afterwards you can reselect Day to view the metrics report in this format.
This behavior causes a level of inconvenience as you must select your desired option once again.
This is working as designed.
However, this enhancement request is to alter the behavior so that if the end user selects the value of day for the view by field, this value will remain even if selecting a date range 14 days or more.