Xcode - Buttons are being clipped by container - how to stop it?

I have a row of NSButtons inside an NSBox that is embedded into a Container View.
What constraints do I implement so my row won't be clipped by the parent Container?

The items on Storyboard versus how the buttons are clipped when running the program:
https://im gur.com/NubUa4G
https://im gur.com/eo5b89u

The following is a standard configuration for a button - I would like same widths and heights and xy location, they can dynamically move as long as they maintain a square shape upon resize.
https:// i.imgur.com/T3NDjlI.png

Note: this is on MacOS, not iOS (so AppKit instead of UIKit)
Xcode - Buttons are being clipped by container - how to stop it?
 
 
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