When looking at the Service Instances of a service in the Details under Transactions & services, I have a list of services but I can only find out which Instance if I click on the name. Is there a way to add it
You cannot modify the screen or show properties of services. However, I recommend to leverage tagging (automatic or manual). This will enable to filter the list and show only the services matching the tag. Also, you can also use the filtering based on technology / process group or service type.
If you are in a situation when many services share the same name (typically "localhost" - this happens when your applications are badly deployed or application servers improperly configured) - you should use the service naming rules to rename your services so their naming will reflect your environment. Or rename them manually if you wish so.