Diagrams in model deleted

After importing terrain none of it could be found. The file contains 4 Kb. Thanks for any advise.

upload file.

practiceMt DE.skp (4.7 MB)

Turn on the tags for the Location Snapshot and Location Terrain. Then Zoom in to the axes. You have something located at a huge distance from the origin so Zoom Extents will make the terrain show very small.

Notice what happens when I choose Zoom Extents. The teraain is shown selected way over on the left.

Here I’ve cleaned up your model and purged unused stuff from it. About 64% file size reduction.
practiceMt DE.skp (1.7 MB)

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You have various locked groups scattered about, once removed you can see this.

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thanks, I must have inadvertently used an incorrect tool.

thanks !