Nested Splitters with Multi-Drag
Try dragging at the intersection of the horizontal and vertical resize handles. When your cursor is at the intersection, both splitters will resize simultaneously!
Left Panel
This is a fixed horizontal panel.
Top Panel
This is the top section of the vertical splitter.
Middle Panel
Multi-drag intersection zone: Move your cursor to the left edge of this panel where it meets the horizontal resize handle. You'll see the cursor change to a "move" cursor, allowing you to resize both dimensions at once!
Bottom Panel
This is the bottom section.
Right Panel
This is a fixed horizontal panel.
Drag at the intersection of resize handles to resize both directions simultaneously.