Empty dropdown list for Package in GUI

I’m new to Appium and trying to connect to a remote Appium server using Appium GUI. I just want to try the Android API Demo app without .apk. Don’t see how the GUI can automatically update the dropdown for remote server without the .apk file. Any pointer? Thanks.

Never mind. It works when I start remote Appium server with “–app-pkg com.example.android.apis --app-activity ApiDemos” options.