Remote Process Groups (RPG) are configured on the NiFi canvas with 1 or more target URLs in the from of a comma separated list. If you go to the summary UI from NiFi's global menu, you will see that only one URI is shown for the RPG.
There may be dozens of RPGs nested many layers deep on the canvas. If a user needs to see if any of them have been configured with a specific URL, the first thought would be to use the summary UI to find that information.
Alternatively, users can use the "Search" bar to search on specific URLs. However, they may not do this since the summary Ui is potentially quicker and better user experience. This also does not work well if they are looking for RPGs which are missing a URL (for example: new node added to target cluster).