Boubt about how to use a module

Hello everyone, I'm a beginner programmer and I'm doing a school project and I have a doubt about how I can use a module in another module. I already have the sample code of how it will look in the end, but there is one thing that changes that is giving an error, when trying to put the "Tarefas" module inside "AdicionarTarefas" everything on the Tarefas screen is visible when AdicionarTarefas. My doubt is exactly if there is any other way to use the module so that it is not visible in the other module.

Here is the github link

As it is, it looks like the image above