This prop is used to be able to update the toggleable layouts to start visible/expanded instead of requiring the toggle button to be pressed.
If this is:
"toggleable" - the "toggleable-mini" variant will still require a
							button click to be visible"toggleable-mini" - the "toggleable" variant will still require a
							button click to be visibletrue - both toggleable variants will start visiblefalse | undefined - both toggleable variants will require a button
							click to be visibleThe type of layout to use when your app is viewed on a desktop sized screen.
The type of layout to use when your app is viewed on a landscape tablet sized screen.
The type of layout to use when your app is viewed on a large desktop sized screen.
Note: Unlike all the other layout types, this one will automatically
						inherit the desktopLayout if it is omitted.
The type of layout to use when your app is viewed on a phone sized screen.
The type of layout to use when your app is viewed on a portrait tabled sized screen.
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The current app size which is used to determine which layout type to return.