I am in the process of adding a sub panel to a detached garage and I have the proper gauge wire connected up to the sub panel (neutral and ground NOT bonded) with 3 conductors + ground running in conduit between the house and detached garage. I am just about to connect everything up to the main panel and after looking closer I noticed a few things that seem odd to me based on everything I've read:

1. I see what appears to be more than one neutral bar
2. One of the neutral bars doesn't appear to be connected to the service neutral?

Here is a picture of the main panel. It is a Westinghouse 200amp (B20 2040CT). You can see the neutral connecting to the bar on the left. The bar on the right does not appear to have anything connected to it yet I see neutral wires from the house connecting into it.

Here you can see the ground bar bonded to the case but no connection between the ground bar and the neutral bar (the neutral bar is isolated from the case)

Finally, here is a closer view of the neutral bar on the right side of the case. This also appears to be isolated from the case and no connection to the ground bar or other neutral bar that I can tell?

Any help here would be greatly appreciated. I'm not completely sure what the best way to move forward is. I have a double pole 60 amp breaker that I'd like to put in the last remaining slots on the left to connect the sub panel to the main panel. Thank you!