Cannot resize one column separate from the entire table

I would like to resize the last column in my table, without resizing the entire table. However, when I attempt to do this by pulling the border of the final column out, the entire table resizes. I would like the table to stay put, and to resize this final column by itself.

UPDATE: Thought I found the answer here , but it didn't work. Trying to adjust leftmost border of the first column or the rightmost border of the last column resizes the entire table, even when using SHIFT + drag.

This worked for me:

Bring up Table Properties and select 'Options'.
Uncheck 'Automatically resize to fit contents'.
From there, I was able to edit the column width's manually (as per other answer).