These are my steps for producing this bug:

First off start out zoomed out the furthest you usually can like so

Then have your engineer/constructor selected, hold shift, in this case press (not hold) shortcut Q to bring up a metal extractor and start queuing up a few

after this shift key, shortcut key, build stuff combo you should now be able to zoom in unusually close like so

now scroll back out to the max like so

the final step can be a bit tricky, it does not always happen/trigger, but scroll in a click or two with the wheel (zoom in a small amount), and immediately after scroll out really fast (like you are trying to make the scroll wheel spin on its own) and you should end up with a view like this

I have been able to zoom out even further depending on how fast I react with the zooming in then out step, I don't think we were meant to see this much of the map and more quite yet.