Grid Options -> Truncate Posts to 0

As you see in the attached screenshot, setting 0 in the "TruncatePosts to" field in the "Grid Options" tab has the effect of displaying the whole text.
I would like to truncate the text to zero characters, effectively no displaying any text as I feel that displaying only the title suffices.
How can I do that?
Is there a way by modifying the source code of some template?

For the future, I would like to propose to let 0 meaning zero characters and introduce a negative value (such as -1) to act as a signal that the whole text must be displayed.