How do I rearrange list order of IT Assets?

How do I rearrange list order of IT Assets?

So my list of IT Assets under the tab Assets is in no good order at all.
It starts fine with something on A and ends with something on Z. But inbetween there is no real order.
In the screenshot you can see the order of the partial list is 
Switch
Workstation
- Laptop
- Desktop
Server
Accessory
IP Phone

How do I rearrange this list? Preferably in self selected order, otherwise Alphabetically would be fine.

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