A blue ghost-image will appear. Use the "Layer Mode" to see exactly where to place blocks one level at a time. Using an Online Viewer
Use the on-screen toggle to inspect the or the 3D Render . Safety and Best Practices Minecraft Schematic Viewer
Using a "ghost" image (hologram) to guide your block placement in Survival mode. Top Minecraft Schematic Viewer Tools A blue ghost-image will appear
Some viewers may not accurately display the "state" of redstone (e.g., whether a lever is on or off), so double-check your wiring! Conclusion so double-check your wiring! Conclusion