Oven Door Latch Lever fell in my hand

Got ready to lock the oven and start self-cleaning process. Moved door latch lever (part #AP4850277, I think) to the right and it dropped into my hands! Not broken, just somehow unattached. Husband says it has been loosey-goosey for a while. (?)
How do I reattach so I can lock and clean the oven?
Do I have to take apart the front panel(s)?
Really appreciate any help - - -