Margin Note 3 on Macbook Pro > has less features than Margin Note Pro 2

So, Margin Note 2 Pro > seems to have more features (using Macbook Pro) then Margin Note 3. I have been struggling with Margon Note 3, only to open Margin Note 2 Pro (back up) to find all the features exist within this version. Can anybody assist?

Specifically, in margin note 3, I cant edit the PDF notebook (in document mode). Pls help.

Thank you for your feedback, would you be able to upload some screenshots or videos describing it in detail? That way I can help you better.