Pressing C when a parametric object is selected doesn’t enter edit “mode” exactly. What it does is make the parametric object editable, in other words it allows you to edit the points and polygons of the object, which you can’t do when it’s a parametric object. This is a permanent change to the object, the triangle icon isn’t going to go away. It just signifies that the object has been made editable. To get out of “points mode” you need to choose the model tool. It doesn’t seem to appear in the Tools menu at the top of the screen, but it’s there in the toolbar on the side of the screen if you’re using the default layout. You’ll see a series of cube icons with various things highlighted to show what they do (points, edges, polygons, etc.). These are the “mode tools” that define what it is you’re going to edit. Choose the very top one, that looks like just a cube, and that is the model tool. With that you can move, rotate or scale the entire object.
Jack