Note that the layout is intended to accommodate differing screen sizes, so setting specific coordinates for items was never an explicit option. But it can be done using styles.
As an example, using the default layout edit the "Rounds" cell. You'll note the HTML of the cell is:
Round<br><round>
Change it to:
<span style="position: absolute; top: 100; left: 100;">Round<br><round></span>
This will place it at position (100, 100), and it will remain there even if you change the screen size, or if you change the window size if you are running in window mode. Change the values of "top" and "left" to position it.