XRay

Make the world around you transparent, except for a select few blocks you're looking for, allowing you to find them easily and effectively.

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Opacity

How transparent unwanted blocks are (0 = fully see through, 100 = fully opaque)

Cave Mode

Only highlights blocks that have at least one side exposed to air

Xray Blocks

Specify the blocks you're looking for. For more information, see the documentation for "Limit to Item" Settings.