Applicable only on auto-layout frames. Determines whether the counter axis has a fixed length (determined by the user) or an automatic length (determined by the layout engine).
counterAxisSizingMode: "FIXED" | "AUTO"
Auto-layout frames have a main axis, which is the axis that resizes when you add new items into the frame. For example, frames with "VERTICAL"
layoutMode resize in the y-axis.
The other axis is called the counter axis.
"FIXED": The counter axis is determined by the user. It can be modified via the UI and via plugins.
"AUTO": The counter axis is automatically determined by the maximum width of children of the frame. It cannot be changed via the UI.