Clearing a Tile System - rotorz/unity3d-tile-system GitHub Wiki
Tiles and chunks can be cleared from a tile system using the tile system inspector or via the context menu in the scene palette.
Ensure that Inspector window is shown by selecting Window | Inspector.
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Select your tile system.
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Click Clear... button in tile system inspector.
A confirmation message should appear:
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Select Yes to clear all tiles and chunks.
Source: topics/Clearing-a-Tile-System.md