I mean if you are trying to keep dust off, your options are pretty much glass doors on the case(s) (other than like, HVAC filtration).
As far as not looking dusty, light colored shelves will hide dust better. I've never had a problem with my books themselves looking dusty. They basically only collect dust on top of the block and that's usually white.
For cleaning, I have a little duster like this: https://www.amazon.com/gp/product/B07N1T9JN2/ Which I run along in front of the books to pick up most of the dust (my shelves are walnut, so they show dust pretty easily). For a really good cleaning of books, I have a brand new paintbrush that I use to give the top of the block a few wipes after blowing it off.
My wife's shelves are white and I can't see any dust on them at all, even though there is.