Another duplicate https://support.zabbix.com/browse/ZBXNEXT-10023:

I would like a tickmark, in the Legend pane on the Graph Widget, where I can disable that the hostname is shown for my items.
When I have tx 10 items from the same Host, it is annoying that the Hostname takes up so much space on the legend, and disabling this will give a much nicer graph.
This feature could/should also with on the popup window, when we do mouseover on the graph.

I hope and assume that this is a (very) minor change, but having this on our Dashboards would mean a lot, in terms of the graphs being much more intuitive and easily understandable.

Today, having a list of items from the same host means that the hostname is repeated a lot in the list of items, and taking both screen estate as well as interfering in the user reading and understanding the graph.