How can I change my default project when doing an ionic build?

I have my angular.json set to use multiple projects, and my mobile project has a namespace of “app-mobile”.

When I try and build with

ionic build --configuration production

which runs the command

ng.cmd run app:build:production

I get the error: Project “app” does not exist.

How can I change this to run

ng.cmd run app-mobile:build:production