Having four items in a SplitView and hiding the third one makes the fourth item to position incorrectly.

import QtQuick 2.1

import QtQuick.Controls 1.0
import QtQuick.Window 2.0
import QtQuick.Layouts 1.0

Rectangle{
width:1200
height:600
SplitView{
anchors.fill:parent
Rectangle

{ id: r1 color: "red" Layout.minimumWidth: 300 height: parent.height }

Rectangle

{ id: r2 color: "yellow" Layout.minimumWidth: 300 Layout.fillWidth: true height: parent.height }

Rectangle

{ id: r3 color: "blue" Layout.minimumWidth: 300 height: parent.height visible:false }

Rectangle

{ id: r4 color: "green" Layout.minimumWidth: 300 height: parent.height }

}
}