> The one feature I miss is the ability to split the screen and have two items open at the same time. Like a PDF journal in one and taking notes on it in the other.

Can you do that on the RPP? I've not really kept up with features other than to check for AI integrations (which they still don't have to my knowledge)

You can't do that yet. I have been asking for the feature for years and it has yet to be implemented.