Pretty much what the title says here. This is true both when looking at success plans from the 360 and from the “global” success plan area (not sure what it’s called) in the navigation pane on the left.
Not all of the columns allow for sorting, the importance of which will vary depending on which view you’re looking at them. However, any column you should add (see also
) should give you the ability to sort by it.

Here’s a short example - wherever you don’t see any shadow on mouse hover or the up/down carrots show next to the column header means you can’t sort.