I guess your model is too far from the origin. Common problem if you've imported or hot-linked/ xrefed a slightly-off DWG file. They may have dots (usually converted "insertion points") that are very far off from the rest of the model.
1. Show all layers.
2. Zoom to Extents. Zoom out even further.
3. Arrow tool, Select All.
Now you should see whatever contont you have highlighted. Locate and zoom in.
Then try exploding and deleting the unneeded content that is off.
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