This works on Android, not sure for iOS:
- Go into a single account (Personal for example)
- Tap on the search icon (top right)
- Search for ‘Summary’
- A list of 'Spending report’s is shown. Tap on any one of them
- At the bottom of the period report, tap on ‘See full summary’
Hopefully it works, to get you to access Summary 
, if it does:
- Tap on the Calendar icon (top-right)
- On the drop-down, tap on ‘Change’ and set the Summary period as required