As of 4D v20, 4D for Mobile is no longer installed by default in the 4D environment.
To benefit from the 4D Mobile development features in 4D, you must install the 4D Mobile App component in the “Components’ folder of your projects.


Notes:
If a converted project uses features from the 4D Mobile App Server Component, make sure you also install it in the “Components” folder of the project.

For more information:
https://developer.4d.com/go-mobile/

* 4D for Mobile goes open source, starting with 4Dv20 *
https://blog.4d.com/4d-for-mobile-goes-open-source-a-big-step-for-the-community/