Grid: Confusing interactions between Columns and Min column width controls when in Auto mode

[noisysocks]

Feedback from @jameskoster:

• When you set a large number of columns, but also a large min-width, it’s a bit strange how any empty extra columns just vanish off the edge of the canvas when you reduce the screen size.
• Similarly it's strange when the columns setting doesn't reflect what you see on the canvas due to the min-width.
• The columns control value doesn’t reflect the canvas when unset – it’s just empty. Could it show the inherited value as a placeholder?
• They're working as I would expect, I just think these controls need some design to better communicate the behaviors. Is min-width definitely needed at this stage?

More of a discussion than anything actionable right now. Any ideas for how to better communicate the interaction between Columns and the Min column width controls?