By default, the view in Observe.AI is always set to 30 days. You have the ability to change the date range.
NOTE*** The date range is dependent on when calls started being processed in Observe.AI
1. Under "view", click on the calendar icon.
2. A dropdown menu will show the following selections:
- Today
- Yesterday
- Last 7 Days
- Last 30 days
- Custom
3. Select "Custom"
A pop-up calendar window will appear and you to select a specific date range. 
4. Once selected, the date range will be applied to all filters, the calls, analyze, and leaderboard tabs.
Video here: