filter a post grid by multiple categories

hi there, I think your plug-in does it but I do not see it on the live demo page.

I would like to filter by multiple categories. like if I had color and shape categories, I want to filterLike this-

Filter= "red" AND "square"

shows results for Red Square options

can you please confirm that I can do this if I purchased the Pro version of your post grid product? and can you show me a demo of this? Or add it to your demo page if you don't have it on there already? I cannot find it. I will purchase if it can do it!thank you so much!