src/vs/workbench/browser/parts/editor/editorActions.ts/SplitEditorOrthogonalAction/getDirection
class SplitEditorOrthogonalAction:	protected override getDirection(): GroupDirection {
		const direction = preferredSideBySideGroupDirection(this.configurationService);

		return direction === GroupDirection.RIGHT ? GroupDirection.DOWN : GroupDirection.RIGHT;
	}