When you want to know which dependencies a project has (with all inherited dependencies) simply select a gradle root or subproject in Navigator or Package explorer and do following context action:
After executing "Show dependencies" you will get a dialog appearing on your screen:
You can choose one of the predefined default entries or type a custom one. When you have already opened this dialog before the former selected configuration will reappear at combobox as default. Also your last dialog location will be persisted and reused.