On the iOS app, you can group records together based on one (or more) fields of your choosing.
In the view you want to group, tap the Group button at the top of the screen.
Tap on the prompt to create a new grouping.
Choose the field to group by and the sort order for the grouped records.
If you need to add more fields to group by, tap "then by" to add the grouping.
When you are finished configuring the grouping, tap "Done". Each group has a header with the name and value of the field used for the grouping. If you have grouped by multiple fields, each subgroup is nested below the previous group.