App parameters are name-value pairs that can be used in defining expressions and designing application services and tasks. You can define the default application parameters at the application level and override them at the environment level.
Similarly, external connections are the configuration settings to connect your apps to legacy email and database servers. These settings are primarily used by nodes while designing your services. You can define the default external connections at the application level and override them at the environment level.
To set param and connection overrides via the Designer, you need to navigate the Environments view and select the environment to override app params and connection settings. You will be directed to the environment details view.
To add a param or connection override, select Add override. To modify the override value or connection setting, select the param override or connection setting and click/tap on its name.
To add a param override or a connection override, you first need to create those values in the App settings view.