In the installation directory for Box Of Stops, you will find the application.properties file. This can be used to control a number of installation level settings in Box Of Stops.
Please see the application.properties.default file in the same directory for a list of the available properties you can set. Note this file is just the template, and will be overwritten whenever you upgrade Box Of Stops. The idea is to copy the setting from here, and set it to your preferred value in application.properties.
If in doubt about how to enter a value in this file, please investigate how to edit a Java .properties file, e.g. on Wikipedia.
Examples
Please see the "What links here" link for a list of pages in this online help related to application.properties.
Backups
It may be useful to know that the application.properties file is automatically backed up. Each time the file is edited, and Box Of Stops is started again, a version is added to the root of the backups.zip.
The reason for doing this is to make it easy to experiment with this file. It's really common in the world of computers to try making a change, then make another change on top of that, and lose track of where you started from.