OptionalbracketSpace between a bracket's end and its button, in pixels.
OptionallaneThe space around the buttons, in pixels: between neighbors, and before the first and after the last. Not scaled by zoom.
OptionallaneThe size of one level's lane across the gutter, in pixels at 100% zoom. A button fills its lane, less laneGap.
OptionalrenderRenders a group's collapse / expand button, filling the square it is placed in. Defaults to OutlineButton.
OptionalrenderRenders a level button, filling the square it is placed in. Defaults to OutlineLevelButton.
Props for the outline: the row and column gutters and their level buttons.
Remarks
The HTML attributes (
className,style, …) apply to each of the outline's boxes: both gutters and both level strips. Where they sit in the sheet is not theirs to change.