Hi!
I made a freedom list page for Opportunity. 
My UI for Opportunity in Classic and Freedom Shell are set to Freedom Pages. 
Is there any other reason why in Mobile it is not using the List Page I created for Opportunity? I don't see in the Opportunity schema object places to set the List Page for Mobile
Note: I created a new Package for Mobile and checked the mobile app option in the package creation. 
Like
Glad to hear you managed to resolve it!
In the event you have general questions regarding Mobile Freedom UI setup, please consult
Freedom UI Mobile Designer and its elements
Set up mobile pages in Freedom UI Mobile Designer
More specific instructions on changing the pages that are being opened on mobile application through manifest can be found in this instruction.