In the front end, in a cell whose style is "Text", how do I typeset Sum so that the limits are literally above and below the sum symbol?
I keep getting this, even when I click on the underset using the "Basic Typesetting" palette:
But I want:
$$\sum_x$$
An answer where I have to directly edit the cell expression using ⌘+⇧+E (or Ctrl+Shift+E on PC) is perfectly fine.

