Use the "piaware-config" utility to view and change settings. Run "piaware-config <setting> <value>" to make changes. Run "piaware-config" to show the current configuration settings.
Edit /boot/piaware-config.txt to make configuration changes, using an editor of your choice (e.g. "sudo nano /boot/piaware-config.txt").
For package-based installs, use piaware-config or edit /etc/piaware.conf.
If it is not convenient to remove the SD card and command line access is not possible. an external USB flash drive containing a piaware-config.txt file can be attached to the Pi. Settings in that file override any settings on the SD card. The flash drive should be attached before powering on the Pi and should remain connected while the Pi is running.
To ensure that all configuration changes take effect, please restart/reboot the Raspberry Pi after making changes.