One way to do that is to keep track of where your model is. Then after Zoom Extents, drag right to left selection boxes around what you expect to be empty space. Check Entity Info to see what you snagged.
There’s also a known bug in which a text item could be off at a great distance. Have you been using any labels?
I would check the template first, if you suspect it’s part of your default. Open a new file and draw a small rectangle at the origin. Does Zoom Extents zoom out? Or in to the rectangle? If in, you’re good to go for future projects.
If your template turns out to be fine, the fastest fix for your current model would be to copy the model and paste it into a new file.
If the template has an issue, then you should fix or just replace the template before moving on.