By default, the test in the V4S Kiosk application is set to the standard font size for iOS and Android devices.

If there are any old volunteers and if they find it difficult to see the text on the device, the font size can be increased on the device.

To increase the font size on the devices,

Go to device settings and search for the "Display & Brightness" option and click it

On the "Display & Brightness" details screen, you see the option as "Text Size" (IOS devices) or "Font Size" (Android devices). Move the bar at the bottom of the device screen to increase the font size, set the font size, and save the changes.