When we moved in to our current house, we had some work done on the garage doors and openers. The service guy explained that he was required to disable the locks, not sure if by company policy or local code. He said if I wanted to re-install them after he left, I was free to do so. He actually loosened the lock, swung it down to the vertical position to disengage and re-tightened the unit. Looks like that screw through the bolt accomplishes the same thing.
A quick Google search resulted in this:
https://www.naturalhandyman.co...agaragedoorlock.html
____________________________________________________
‘‘Laws that forbid the carrying of arms... disarm only those who are neither inclined nor determined to commit crimes... Such laws make things worse for the assaulted and better for the assailants; they serve rather to encourage than to prevent homicides, for an unarmed man may be attacked with greater confidence than an armed man.’’
— Thomas Jefferson's "Commonplace Book," 1774-1776, quoting from On Crimes and Punishment, by criminologist Cesare Beccaria, 1764