Please describe the new feature or change.

The quiver should have its own slot rather than using the back slot. The back slot is often used for backpacks and I don't want to have to pick one or the other.

Please describe why you want this feature.

The quiver is rendered on your hip, so it doesn't make a lot of sense for it to use the back slot.

I can't find any information on the quiver being a vanilla item. But regardless, my previous point still stands. Curios itself does not put any item into any slot or add any slots itself.

Curios does not add any slots or items natively, you need to ask for this from the mod that adds the quiver that you're referring to.

Quiver is a vanilla item

Sorry i thought vanilla used to have a quiver on a different version. It was supplementaries and I figured it out.