How to safely remove exterior metal panel?
That is standard aluminum soffit, much like the vinyl sort, and one piece locks into the preceding one the same way. Look closely at both ends, and if you can't see any fasteners try to slide the end piece toward the middle. If it doesn't go try the same on the other end. One end or the other should pop out and you'll then see how it's fastened. It's usually nailed like vinyl. Be careful handling it as it bends and dents easily.

Phil