This property makes the current element cover its parent element, by setting position to 0% (X) 0% (Y) and size to 100% (Width) 100% (Height).
Every single element (Building Block) contains “Fit to parent” button, next to size and position inputs.
In the example below, this property is used to specify how an image element resize and fit the container.
(1) CONTAINER (PARENT)
(2) IMAGE ELEMENT (CHILD)
(3) RESET POSITION
(4) FIT TO PARENT