Hello,
The documents we provide include the official documents of LVGL 9.1 because our system has the official library of LVGL 9.1 built in, and the official functions can be called normally.
Regarding the Pomodoro application, the code of the application is built in the firmware, not in the disk, so it cannot be viewed directly. We will open the code of the built-in App (including Pomodoro) and some other built-in functions in the future.
We saw that an engineer in the forum provided an example, you can also refer to it: Any tutorial on how to print out non-ascii text on screen using LVGL? - #2 by ToBeHH
If you have any questions about the use of the product, please feel free to contact us.