Hello, I would like to add a Morph with a splitter in the DrGeo window. So far I am using LayoutFrame with fixed pixel offset to adjust the various components of a DrGeo window (see code below) Now I don't understand how I can hide the rightPanel morph, and get the area morph to take the whole horizontal extent. Message hideLeftOrTop only hide the morph but do not change the layout of remaining visible morph I can hand change the layout but I wonder if there are any proporer way to do it? All in all, I would like to simulate a collapse function in the splitter. Hilaire installTools | bar shiftY statusY rightPanel| rightPanel := Morph new color: Color blue. shiftY := DrGDefault isTablet ifFalse: [self installMenu] ifTrue: [0]. shiftY := self installToolbarsAt: shiftY. statusY := self statusbar minExtent y max: DrGDefault wheelWidth. self addMorph: area fullFrame: (LayoutFrame fractions: (0.1 @ 0 corner: 1 @ 1) offsets: (0 @ shiftY corner: DrGDefault wheelWidth negated @ statusY negated)). self addMorph: rightPanel fullFrame: (LayoutFrame fractions: (0 @ 0 corner: 0.1 @ 1) offsets: (0 @ shiftY corner: 0 @ statusY negated)). self installWheelsFrom: shiftY to: statusY. self addMorph: self statusbar fullFrame: (LayoutFrame fractions: (0 @ 1 corner: 1 @ 1) offsets: (0 @ statusY negated corner: (DrGDefault wheelWidth + DrGDefault wheelHeight) negated @ 0)). self statusbar borderStyle: (BorderStyle inset width: 1); cornerStyle: #square. self themeChanged; openInWorld