CSS Grid lines do not show

I’ve been trying to use CSS Grid but the grid lines do not display on the designer panel as shown in the tutorial. I cannot build the page without these lines visible. Any ideas why they won’t display?

See this page, and look at: 2. Visual helpers.

Thanks Marf… I hoped it was something as simple as this rather than my application was not set up correctly - which, BTW, has proven to be an absolutely solid and reliable development environment. Agree?

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