The keyboard has a basic plastic music stand that slots into the top of the keyboard. Unfortunately, it's only half the height of A4 paper (so sheet music flops over), only two A4 pages wide (portrait orientation), and I often use sheet music that's three or four pages wide.
My simple solution, so far, to dealing with inadequate music stands on piano is to use a thick cardboard folder and bulldog clip music sheets to it. Though it likes to skid off on this piano, so some adhesive velcro has been attached.
Out on a gig it wouldn't be too bad to just put a standalone portable music stand behind the piano, but that takes up too much space at home. And you'd end up with a collection of overlapping stands—one for the keyboard, another for the music, another for a light (though a reading light could be attached to the back of a sturdy music stand). So I'm contemplating several different music stand solutions:
Make a larger version of the slot-in stand, and hope that it'll fit into the piano without any problems. My old Technics portable keyboard had a sturdy wireframe music stand, that zig-zagged up and down in a large M shape.
Or something that attaches to the bottom of the piano, using the leg mounting holes.
Or, make a larger music stand that attaches to the box stand I've just made.