To edit placement data, open the Data File Editor in Tools - Data File Editor and open any file in StreamingAssets/native_data/script/actAssetSet. Click any of the assets in the list to modify them in the Inspector and click Save to save the file. Uncheck Show Asset Gizmos or Show Area Gizmos if the Scene view is too cluttered. Map models are not loaded automatically, but you can find their name in the ActAsset_Map entry and refer to this guide to load them manually: