ComponentReactregistry:ui1 dependency
Resizable Panels
resizable-panels
Two panels and a divider that can be dragged or driven from the keyboard.
1 demo
See it in use
Files this registry ships to demonstrate the item. They are indexed and installable, but they don't count as components of their own.
A worked example of Resizable Panels: Two panels and something to drag between them, where the divider is a real separator that also works from the keyboard.
@mischief