@Doar Absolutely you can do this several ways! It also depends on the type of network that you have setup. If you could provide screenshots it would be great.
I see my clients when I select a "Network" dropdown then go > Network Wide it will bring you to a page that has an overview of your entire network with all the clients listed.
you will see columns in the middle that look like this. You can also click the top of the Usage column to quickly sort by most utilized. Once you find that bandwidth-hogging client you then can click details which will bring you to the device summary page for that client. You will see an awesome graph on the right showing the applications that the device is using so maybe you can create some new policies.
I know that was long-winded but if you can provide screenshots of what you see.