I have a lock with a weird switch, questions on behavior : Locksmith

I have a weird lock that has a switch on it. The door lock has a latch and bolt combined in one.

When the switch is off, the door knob cannot be turned from the outside. When it is on, the handle can be turned from the outside. It also expectedly unlocks the latch, but unexpectedly, it also unlocks the bolt!

Is there a way to alter the lock so that when the handle is turned from the outside, it only unlocks the latch?

I’m failing to see the point of the bolt aside from being tougher to knock down. The issue is, I can’t have my bolt decide whether or not the door can be opened.

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