This panel cannot collapse
+{{ collapsibleSizes[1]?.toFixed(1) }}%
+Additional information and details appear here when the panel is expanded.
+{{ outerSizes[0]?.toFixed(1) }}%
+{{ innerSizes[0]?.toFixed(1) }}%
+This is a nested vertical layout inside the horizontal layout.
+{{ innerSizes[1]?.toFixed(1) }}%
+You can nest resizable layouts to create complex interfaces.
++ Size: {{ panelSizes[index]?.toFixed(1) }}% +
+