Indicates if the element is collapsed or expanded.
If collapsed is true, the element is not displayed on the app under
any circumstances. Unlike a
hidden element, a collapsed element doesn't take up any
space on the app.
If collapsed is false, the element may be displayed on the app.
However, an expanded element (an element whose collapsed property is
false) is still not displayed if:
hidden.Even if the element is not displayed due to the conditions
mentioned above, if its collapsed property is false, it's
displayed when the conditions no longer apply.
To determine if the element is actually visible, use the
isVisible property.
To set the collapsed property on an element, use the element's
collapse() and expand() functions.
If you select Collapsed on load in the element's Properties panel
in the Editor, the collapsed property is set to true when the app loads.