Working with multiple windows on the same scene unity

I want to work with multiple windows on the same scene. It's like creating a lot of popup windows on the same scene and then making some visible/invisible when they're needed

To do this, i currently am:

1) Creating a canvas for each window

2) Creating an empty gameobject inside each canvas

3) adding a POPUPWINDOWBEHAVIOR(which i created) to each empty gameobject

3.1) This behavior is something like this:

• on the Start() function, i get it's current initial position, then i use transform.localPosition = new Vector3(1000, 1000); to fling the whole window(the empty gameobject and it's children) to a place where the user won't see them

• Then, when i need to show the window, i make the object return to initial position

• When i need the object to disappear, i fling the whole window(the empty gameobject and it's children) to a place where the user won't see them

4) Create the canvas, empty gameobjects and its children on new layers(always)

5) Make one initial window appear(the one from the lowest layer) and make the other ones appear/disappear whenever i need them

Is there a better way to work with multiple windows on the same scene on unity? I do not want a simple popup window, i want a whole screen