Go to Analytics tab, add an empty chart (i.e., Time chart). Then go to Chart view size and click on 'Application fixed size' or 'This chart fixed size'. Open Favorite sizes drop-down menu and make a screenshot.
You will need it later to manually re-enter all those sizes.
Remember to make sure you will do it from top to bottom, as this is how its order is decided. These are not sorted but appear in order of creation.