You need to connect to the Server first as the Client have no idea which Jobs exists on which server unless a successful connection and sync has been done.
Once connected you can go to the list tab. This one contains a search, however, currently it does only search on the currently selected Server.
I think I know what you are looking for but it is a bit more complex. Compare it to that you want to search for a file on the whole network of computers.
We have some thoughts about adding a scan on the network for finding servers on the network. However, we have not thought about actually connecting and syncing Jobs yet as we have not find the use for it yet - and also, that it is time consuming. This might be one reason for adding such but we cannot promise anything. I am moving this topic to Feature requests forum.