The Downloads View can be called up by clicking on its icon all the way to the right of the Views Selector.
If downloads are active, this icon will have a little arrow in its left corner. If no downloads are active, no icon is shown.
If no downloads are running, the Downloads View will simply be empty and you can go back to any other view by clicking on that view's name.
If downloads are active, they will be listed, grouped by collection. A progress bar shows the current download progress, with a time estimate on how long the download will take.
You can abort any download by clicking on the X to the right of its entry.