Xray

Hides or fades out every block except the ones you pick.

The blocks you keep are drawn normally, so ores, spawners and anything else you choose stand out through the rock around them. Caves behind the hidden rock still render, and the sides of picked blocks that face hidden rock are drawn instead of being left as holes. Turning Xray on or changing any setting rebuilds the chunks around you, which can take a moment.

Chests and other blocks with their own models, like signs and banners, are not hidden.

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Blocks

The blocks to keep visible, chosen with the block picker. Defaults to every ore, ancient debris and spawners.

Switch the picker to blacklist to hide only the blocks you list and keep everything else.

Opacity

How visible the other blocks are, from 0 to 100 percent. At 0 they are hidden entirely; higher values draw them as see-through glass so you keep a sense of the terrain.

Fullbright

Lights the whole world at full brightness while Xray is on, so ores buried in the dark are still easy to see.

Render Fluids

Keeps water and lava visible. With this off they are hidden along with everything else.