Making the Synopsis panel bigger

How can I make the Synopsis panel take up more space in the Inspector, please?

I’ve decided to move a regular column into Scrivener, so that I can use the Outliner to see what two subjects I’ve dealt with in each column, and view them as an outline if I want to check back over the weeks.

But for that I need a slightly longer outline - two sentences rather than one. I know the text just moves down, but I’d like to be able to see all of the outline at the side of the document, which means having the Synopsis section take up half of the space at the right. How can I do this?

The synopsis area, being an index card, has a 5 x 3 ratio, so the only way to make it longer is to widen the inspector.
All the best,