Mini 16MP IMX519 Camera SKU: B0389

Can the focus be adjusted on this model or is it fixed?

Yes, it doesn’t have a voice coil motor, but the lens can be adjusted using an external tool (just like the Raspberry Pi v2 camera)

I can’t get mine to turn at all. Is it glued?

Sorry for the wrong information, I just checked and the lens is indeed glued (the information I got is that the glue is not very strong) I don’t recommend that you force it.
I think about adjusting the lens, you can contact [email protected] to see if they have better suggestions.