Each report represents a defined timeframe you can change by tapping on the dates in the upper right.
You can define a start and end date, both selected days are included in the reports data.
You can compare two timeframes by flipping the compare switch and selecting a second start/end date.
For faster access, the most often used timeframes are available with a quick selection like “today”, “last month”, etc – these select the dates for you.
To approve your selection and close the dialog, tap anywhere on the screen.