The button Standard Views in the middle of the Home ribbon tab at the top will create a new set of views from the selected ICS file. In case you close the window by mistake you can just click the Standard Views button to open the window again. Every time you click the button, there will be a new set of views which will have no direct relation to any pre-existing sets of views. If you want to edit an existing set of views, right click on a view and choose Edit View Orientation.