Can I edit / customize the icons, colors, fonts, sizes, layout ... or the raw CSS?

We are not promising that ActionTiles will have have the same degree of color / style customization the SmartTiles has offered via "Custom CSS".

Our roadmap is not laid out for this yet.

In the long term, quite likely our customization options will be much better than SmartTiles; ... but that doesn't mean that we will implement free-form Custom CSS. Or maybe we will. Unknown, undecided!

The incredible Custom CSS efforts / results of the SmartTiles Community are recognized and appreciated. Your wish-list for customization is actively being noted; and we will start some Topics about this in our Forum over the next several weeks.