With the Services Integration enabled, you can see which volunteers have checked in right from the Services app, without having to switch to Check-Ins. This integration syncs any live check-ins that happen on the station side over to Services.
Go to the event settings to make sure the Services Integration is set to Enabled.
For the two applications to connect, make sure the person checking in is the same person who is scheduled in the Services plan and are checking into the same time they are scheduled to in Services. This will automatically set them as a volunteer.
When this integration is enabled, you'll see a small Check-in icon next to the time people have checked in.
Then, after the service, use the Services report to see who did not check in but confirmed on the schedule. In a plan, select print then choose the CHECK-INS: Absent people report.