Splitter.Panels in a Splitter with a height, and set defaultSize, min and max on the one you want to size.orientation="vertical" to stack the panels and drag the bar up and down.emphasis to subtle for a line that shows on hover, default for a thin line, or strong for a wider bar.grip to "auto" to show the drag handle on hover, focus or drag, true to always show it, or false to hide it.Splitter.Panel for three resizable panels, with collapsible on the ones that can fold away.collapsible to a panel for collapse buttons on its bar, or { start, end } to collapse it in both directions.collapsible.motion on the Splitter to animate panels as they collapse and expand, which is off by default.collapsible.showCollapsibleIcon to show its collapse buttons on hover ("auto"), always or never.size and update them from onResize.resizable={false} on a panel to lock its size so its bar cannot be dragged.onDraggerDoubleClick to put the panels back to their starting sizes when someone double-clicks a bar.lazy to show a preview line while dragging and resize the panels only when the drag ends.Splitter inside a panel of a horizontal one to split the screen both ways.