NSPanel and Nextion question

I managed to successfully flash a Sonoff NSPanel with ESPHome and can see events such as button pressed in the console. For this round, I just made one single UI tab with one button on it, using Nextion editor.

As an experiment, I modified the UI to have two tabs since the original UI of NSPanel had tabs (or so I think!). The UI designed using Nextion is simple and has two tabs (1,2) and each has a button. But for some reasons, NSPanel only shows one tab so just want to check if anyone here has a NSPanel working with more than one tab in the UI?