Invisible Grid Rows

I had a 1x3 grid, somehow it changed to a 1x4, but the last row is invisible. I can’t figure out how to view the last row to delete it. Any ideas anyone?

Some things that might work …

Enlarge the containing element (section or container), thus giving more total space to the grid and perhaps allowing the ‘invisible’ row to appear.

Reduce the size of one or two other rows, giving the invisible row some space to claim.