Composition
One surface per slide
Pick the layout by what the body already brings with it.
Flat body
ContentSlideCard
The body is a paragraph or a short definition list with no frame of its own. The panel gives it one.
Framed body
OpenContentSlide
The body is a BulletList, a StatGrid, a table. It draws its own rules, so the slide stays open around it.
No heading
FocusSlide
The block is the whole point and the heading was scaffolding. Code, one image, three figures.
In development
The console warning
Put a block carrying data-slide-surface inside a panel and the console names the two layouts to use instead.