Layer
In a Card View, a layer is either a row (in a horizontal card layout) or a column (in a vertical card layout) that can contain any number of card items.
In a simple card layout, a chain of items can take one of two available orientations: all items can be arranged either in a single row (the horizontal layout – the View’s RowLayout property is set to rlHorizontal) or in a single column (the vertical layout – the View’s RowLayout property is set to rlVertical).
Layers are used when a split layout is applied to a card. A card can be split into the specified number of horizontal or vertical layers, using the item’s Position.BeginsLayer property.
This property is a toggle. When active, the next layer (a row or a column) is created. The new layer begins with the current item and includes all subsequent items until the next item with the Position.BeginsLayer property activated is matched.