Post Grid – filter pages?

Hi –

This has ALMOST exactly what I need. I’m looking to display some pages on a grid on a page. The feature does exactly this, apart from I don’t seem to be able to filter pages at all – it’s literally ALL pages on my site, or none.

Have I missed something, or is this a limitation? I’ve added a “add categories to pages” plugin, but this feature doesn’t seem to be able to “see” these.

Any and all help appreciated.