First of all, very nice plugin!
I wonder how I can change the font of the title and excerpt showing in my grid. I went into the layout editor, but I don't seem to have a window underneath to edit CSS as shown in many of your screenshots, for example: https://pickplugins.com/question/font-color-unreadable-post-grid/. Can I put in code in my Custom CSS to edit the font? Thanks a lot!