DMN Editor not immediate how to relinquish space on the right

In this example,

One may notice the Description annotation column is "wasting" a lot of space. If I try to resize the Description column, I cannot:

as the cursor does not change to horizonal resize cursor for the column.

I later figured the only way is to act on the top-most parent.
Can you consider if there can be a more easier/faster UX experience for this, please?
Thanks