If the org is with older volunteers, the font size can be increased on the devices which are used in the org for Volunteer Check-Ins.
More information is given below to increase the font size on the devices
- Click on the device Settings icon
- Scroll down to section "Display & Brightness" and click it
- On the "Display & Brightness" details screen, you see the option as "Text Size" (IOS devices) or "Font Size" (Android devices)
- There is a bar at the bottom of the device screen to increase the font size,
- Increase the font size as per your requirement
- Click the back button to save the changes you made to the font size.