You can alter <presto-meta> elements with a viewconfig name to point to a separate JSON configuration file to provide view configuration for all views that are included in a basic app.

For basic apps, this meta-data element initially contains a CDATA marked section that contains an array with JSON objects, each of which is configuration for one view, such as this example:

You can move this configuration to a separate file to make it easier to customize this configuration and then update this <presto-meta> element to point to that separate file, such as this example:

See Customize Built-In Chart Attributes for instructions and an example of this process.